ST11257DS
Modification of Airbus A321-253NX aircraft to re-pitch several rows of main cabin seats. Held by American Airlines INC, which holds 377 approved modifications in all. Last revised July 18, 2020. System: cabin, seats and restraints.
What it applies to
- Kind of product
- Aircraft
- Design holder
- Airbus SAS
- Models
- A321-253NX
- Type certificate
- A28NM
- On this site
- Airbus A321 929 registered
- The FAA's record
- On the FAA's site
What an approved modification is
A supplemental type certificate is the FAA's approval of a change to a certified design: a new engine or propeller, avionics, an autopilot, floats, a parachute, a larger fuel tank, an ice-protection kit. The company holding it may sell the kit and the paperwork to owners of the listed models; the modification then becomes part of that aircraft's record. The FAA's list says what was approved and for which models, not how many aircraft carry it.
Source: FAA supplemental type certificates (Dynamic Regulatory System). Register counts from the FAA register of October 7, 2026.