The U.S. aircraft register, updated daily
Who holds what · as the FAA records the name

Delta Air Lines INC

Holds 2 approved modifications, most of them for the Boeing 737. FAA spelling: Delta Air Lines Inc.

Approved modifications 2 · newest first

Boeing 737 2
2012-05-31ST03118CH · Reconfiguration of interior seating to create an Economy Comfort class section · 737-800 Series
2012-05-30ST03117CH · Reconfiguration of interior seating to create an Economy Comfort class section · 737-700 Series

Source: FAA Dynamic Regulatory System (type certificate data sheets, supplemental type certificates, technical standard order authorisations). An organisation's name is as the FAA spelled it on each record; related spellings are separate pages.