The U.S. aircraft register, updated daily
Engines · turbofan · data as of October 5, 2026

CFM International CFM56 series

709 aircraft on the U.S. register carry a CFM International CFM56 series engine, rated at about 2200 horsepower. The Boeing 737 is the model most often fitted with it (488 aircraft). The aircraft carrying it were built between 1988 and 2018.

The FAA records engines by code, usually at the level of a series ("O-320 series") rather than the exact variant; this page gathers every FAA code that reads as CFM International CFM56 series. FAA spelling: CFM56 SERIES.

Fitted to model families

Boeing 737488Airbus A319113Airbus A32068Airbus A32134Douglas DC-84Boeing 7571Dassault FALCON 20001

Boeing 737 · Airbus A319 · Airbus A320 · Airbus A321 · Douglas DC-8 · Boeing 757 · Dassault FALCON 2000

Where they are owner's state

Texas207Georgia185Illinois131Utah102Washington19Delaware18Missouri9Arizona6Minnesota4Florida4

Kind of aircraft

Airliners and large jets708 (100%)Business jets1 (0.1%)

When the aircraft were built by decade

0112223334446119607198021419904462000322010

What the FAA has certified, ordered and been told about the CFM International CFM56 series the component layer

The design is held under 4 type certificates. The FAA has issued 56 airworthiness directives (orders that owners must comply with) that name this engine series. Operators and repair shops have filed 2,440 failure reports with the FAA since 1995, 738 of them in the last ten years.

FAA orders 56 airworthiness directives · newest first

2023-05-102023-05-05 · Turbine Engine Compressor Section · engine
2022-03-222022-02-03 · Turbine Engine Accessory Drive · engine
2021-09-282021-16-08 · Turbine Section · engine
2021-06-242021-10-09 · Turbine Engine Compressor Section · engine
2019-07-052019-12-05 · Turbine Section · engine
2019-01-102018-26-01 · Turbine Engine Compressor Section · engine

All orders naming the CFM International CFM56 series

Failure reports 2,440 since · what operators and shops told the FAA

0621251882509500051015202511226

Parts most often reported as the reports name them

Engine359Pump62Hmu49Floor Support46Actuator44Frame44Floor Panel40Sensor40Skin39Connector35

Latest reports

2026-09-27Engine: smoke
2026-09-24Engine: fire
2026-09-23Warning Light: false activation
2026-09-22Engine: power loss
2026-09-21Blades: dented

Certificates and bulletins

E37NEType certificate held by Cfm International S.A. · 52 models listed · revised January 15, 2026
E38NEType certificate held by Cfm International S.A. · 52 models listed · revised January 15, 2026
E00055ENType certificate held by Cfm International S.A. · 49 models listed · revised August 19, 2024
E00056ENType certificate held by Cfm International S.A. · 49 models listed · revised August 19, 2024

Safety bulletins 9 · advice, not orders

2014-05-28NE-08-17R3 · Turbine Section - Propulsion Technology LLC Unapproved Repair
2014-01-28NE-13-33R2 · Turbine Engine Air Inlet Section - LP Turbine, Stage 1 Nozzle Vanes
2013-06-24NE-13-33R1 · Turbine Engine Air Inlet Section - LP Turbine, Stage 1 Nozzle Vanes
2013-05-13NE-13-33 · Turbine Engine Air Inlet Section - LP Turbine, Stage 1 Nozzle Vanes
2012-04-27NE-12-29 · Engine Fuel Distribution CFM56-5B LPTACC Fuel Manifold

Sources: the FAA's type certificate data sheets, airworthiness directives, supplemental type certificates, special conditions and special airworthiness information bulletins (Dynamic Regulatory System), and the FAA's service difficulty reports. A failure report is what an operator or repair station chose to file; the counts show reporting as much as reliability, and larger and commercial fleets report more. How the systems are grouped.

Connections how this engine series links to the rest of the register

Fitted to
Where they are
Biggest operators
Airworthiness

These connections as data: /graph/engine/cfm-international-cfm56-series.json · about the eFlight graph.

Aircraft newest certificates first · 709

Tail no.Maker and modelGroupOwner and baseCertificateRegisteredStatus
N37252 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 2000-09-14 ValidFAA registration status code V: Valid registration. All codes
N944AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-09-07 ValidFAA registration status code V: Valid registration. All codes
N33209 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 2000-09-01 ValidFAA registration status code V: Valid registration. All codes
N943AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-08-30 ValidFAA registration status code V: Valid registration. All codes
N778SW Boeing
737-7H4
Fixed-wing, multi-engine Southwest Airlines CO
Dallas, Texas
Standard 2000-08-29 ValidFAA registration status code V: Valid registration. All codes
N397DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-08-25 ValidFAA registration status code V: Valid registration. All codes
N398DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-08-25 ValidFAA registration status code V: Valid registration. All codes
N396DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-08-21 ValidFAA registration status code V: Valid registration. All codes
N941AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-08-16 ValidFAA registration status code V: Valid registration. All codes
N942AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-08-15 ValidFAA registration status code V: Valid registration. All codes
N742PS Airbus Industrie
A319-112
Fixed-wing, multi-engine Bank of Utah Trustee
Salt Lake City, Utah
Standard 2000-08-14 ValidFAA registration status code V: Valid registration. All codes
N395DN Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-07-18 ValidFAA registration status code V: Valid registration. All codes
N618AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seatac, Washington
Standard 2000-07-12 ValidFAA registration status code V: Valid registration. All codes
N619AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seattle, Washington
Standard 2000-07-10 ValidFAA registration status code V: Valid registration. All codes
N393DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-07-03 ValidFAA registration status code V: Valid registration. All codes
N394DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-07-03 ValidFAA registration status code V: Valid registration. All codes
N937AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-06-20 ValidFAA registration status code V: Valid registration. All codes
N936AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-06-16 ValidFAA registration status code V: Valid registration. All codes
N14250 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 2000-06-02 ValidFAA registration status code V: Valid registration. All codes
N25201 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 2000-06-01 ValidFAA registration status code V: Valid registration. All codes
N935AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Ft. Worth, Texas
Standard 2000-05-23 ValidFAA registration status code V: Valid registration. All codes
N934AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-05-17 ValidFAA registration status code V: Valid registration. All codes
N933AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-05-15 ValidFAA registration status code V: Valid registration. All codes
N391DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-05-09 ValidFAA registration status code V: Valid registration. All codes
N932AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-05-08 ValidFAA registration status code V: Valid registration. All codes
N390DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-05-01 ValidFAA registration status code V: Valid registration. All codes
N765SW Boeing
737-7H4
Fixed-wing, multi-engine Southwest Airlines CO
Dallas, Texas
Standard 2000-04-25 ValidFAA registration status code V: Valid registration. All codes
N931AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-04-24 ValidFAA registration status code V: Valid registration. All codes
N389DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-04-19 ValidFAA registration status code V: Valid registration. All codes
N930AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Ft. Worth, Texas
Standard 2000-04-10 ValidFAA registration status code V: Valid registration. All codes
N929AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-03-27 ValidFAA registration status code V: Valid registration. All codes
N615AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seatac, Washington
Standard 2000-03-06 ValidFAA registration status code V: Valid registration. All codes
N928AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-02-08 ValidFAA registration status code V: Valid registration. All codes
N388DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-02-02 ValidFAA registration status code V: Valid registration. All codes
N927AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-01-28 ValidFAA registration status code V: Valid registration. All codes
N614AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seatac, Washington
Standard 2000-01-25 ValidFAA registration status code V: Valid registration. All codes
N387DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 2000-01-18 ValidFAA registration status code V: Valid registration. All codes
N926AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 2000-01-18 ValidFAA registration status code V: Valid registration. All codes
N613AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seatac, Washington
Standard 2000-01-12 ValidFAA registration status code V: Valid registration. All codes
N386DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-12-21 ValidFAA registration status code V: Valid registration. All codes
N14249 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-12-13 ValidFAA registration status code V: Valid registration. All codes
N757LV Boeing
737-7H4
Fixed-wing, multi-engine Southwest Airlines CO
Dallas, Texas
Standard 1999-12-01 ValidFAA registration status code V: Valid registration. All codes
N385DN Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Experimental 1999-11-22 ValidFAA registration status code V: Valid registration. All codes
N923AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-11-19 ValidFAA registration status code V: Valid registration. All codes
N27246 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-11-12 ValidFAA registration status code V: Valid registration. All codes
N612AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seatac, Washington
Standard 1999-11-03 ValidFAA registration status code V: Valid registration. All codes
N922AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Forth Worth, Texas
Standard 1999-11-01 ValidFAA registration status code V: Valid registration. All codes
N383DN Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-10-20 ValidFAA registration status code V: Valid registration. All codes
N14240 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-10-19 ValidFAA registration status code V: Valid registration. All codes
N382DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-10-14 ValidFAA registration status code V: Valid registration. All codes
N921AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-10-13 ValidFAA registration status code V: Valid registration. All codes
N611AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seatac, Washington
Standard 1999-10-07 ValidFAA registration status code V: Valid registration. All codes
N920AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-10-06 ValidFAA registration status code V: Valid registration. All codes
N24736 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-09-28 ValidFAA registration status code V: Valid registration. All codes
N14735 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-09-23 ValidFAA registration status code V: Valid registration. All codes
N380DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-09-23 ValidFAA registration status code V: Valid registration. All codes
N27734 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-09-16 ValidFAA registration status code V: Valid registration. All codes
N919AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-09-16 ValidFAA registration status code V: Valid registration. All codes
N381DN Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-09-14 ValidFAA registration status code V: Valid registration. All codes
N35236 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-09-13 ValidFAA registration status code V: Valid registration. All codes
N918AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-09-13 ValidFAA registration status code V: Valid registration. All codes
N749SW Boeing
737-7H4
Fixed-wing, multi-engine Southwest Airlines CO
Dallas, Texas
Standard 1999-09-03 ValidFAA registration status code V: Valid registration. All codes
N917AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-08-30 ValidFAA registration status code V: Valid registration. All codes
N16732 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-08-25 ValidFAA registration status code V: Valid registration. All codes
N609AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seattle, Washington
Standard 1999-08-24 ValidFAA registration status code V: Valid registration. All codes
N379DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-08-23 ValidFAA registration status code V: Valid registration. All codes
N378DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-08-16 ValidFAA registration status code V: Valid registration. All codes
N14235 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-08-11 ValidFAA registration status code V: Valid registration. All codes
N916AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-08-09 ValidFAA registration status code V: Valid registration. All codes
N607AS Boeing
737-790
Fixed-wing, multi-engine Alaska Airlines INC
Seattle, Washington
Standard 1999-07-30 ValidFAA registration status code V: Valid registration. All codes
N915AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-07-30 ValidFAA registration status code V: Valid registration. All codes
N24729 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-07-29 ValidFAA registration status code V: Valid registration. All codes
N914AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-07-21 ValidFAA registration status code V: Valid registration. All codes
N912AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-06-28 ValidFAA registration status code V: Valid registration. All codes
N26232 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-06-25 ValidFAA registration status code V: Valid registration. All codes
N737AG Boeing
737-7BF
Fixed-wing, multi-engine Funair CORP
Aventura, Florida
Special flight permit 1999-06-23 ValidFAA registration status code V: Valid registration. All codes
N913AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-06-21 ValidFAA registration status code V: Valid registration. All codes
N14228 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-05-28 ValidFAA registration status code V: Valid registration. All codes
N910AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-05-27 ValidFAA registration status code V: Valid registration. All codes
N909AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-05-20 ValidFAA registration status code V: Valid registration. All codes
N908AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-05-14 ValidFAA registration status code V: Valid registration. All codes
N377DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-05-11 ValidFAA registration status code V: Valid registration. All codes
N13227 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-05-05 ValidFAA registration status code V: Valid registration. All codes
N907AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-04-30 ValidFAA registration status code V: Valid registration. All codes
N21723 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-04-23 ValidFAA registration status code V: Valid registration. All codes
N906AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-04-19 ValidFAA registration status code V: Valid registration. All codes
N27722 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-04-16 ValidFAA registration status code V: Valid registration. All codes
N905AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-04-01 ValidFAA registration status code V: Valid registration. All codes
N726SW Boeing
737-7H4
Fixed-wing, multi-engine Southwest Airlines CO
Dallas, Texas
Standard 1999-03-31 ValidFAA registration status code V: Valid registration. All codes
N23721 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-03-10 ValidFAA registration status code V: Valid registration. All codes
N904AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-03-09 ValidFAA registration status code V: Valid registration. All codes
N13720 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-03-01 ValidFAA registration status code V: Valid registration. All codes
N903AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-02-16 ValidFAA registration status code V: Valid registration. All codes
N902AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-02-10 ValidFAA registration status code V: Valid registration. All codes
N901AN Boeing
737-823
Fixed-wing, multi-engine American Airlines INC
Fort Worth, Texas
Standard 1999-02-09 ValidFAA registration status code V: Valid registration. All codes
N17719 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-02-04 ValidFAA registration status code V: Valid registration. All codes
N13718 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-01-26 ValidFAA registration status code V: Valid registration. All codes
N29717 Boeing
737-724
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1999-01-26 ValidFAA registration status code V: Valid registration. All codes
N376DA Boeing
737-832
Fixed-wing, multi-engine Delta Air Lines INC
Atlanta, Georgia
Standard 1999-01-19 ValidFAA registration status code V: Valid registration. All codes
N26226 Boeing
737-824
Fixed-wing, multi-engine United Airlines INC
Chicago, Illinois
Standard 1998-12-23 ValidFAA registration status code V: Valid registration. All codes
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Source: FAA Civil Aviation Registry, Releasable Aircraft Database (the engine reference table and each aircraft's engine code), October 5, 2026. Horsepower and thrust are the FAA's figures for the series, not for a particular aircraft.