# N521SW: not currently registered

- Registered now: No (not in the FAA registry file). The mark may be reserved or free to assign
- Earlier aircraft: 1
- Last cancelled: December 4, 2021
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=521SW
- Page: https://openairdocs.org/aircraft/N521SW

## Aircraft that carried N521SW

- [Cancelled 2021-12-04](https://openairdocs.org/deregistered/N521SW-2021-12-04): Boeing 737-5H4, S/N 25320, built 1991. Registration expired, pending cancellation. Owner: [Southwest Airlines Co](https://openairdocs.org/faa-owner/SOUTHWEST%20AIRLINES%20CO), [Dallas, TX](https://openairdocs.org/faa-place/TX/Dallas)

## FAA accident and incident reports on N521SW (2)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Incident 19970113004779I](https://openairdocs.org/incident/19970113004779I), Jan 13, 1997: Boeing 737500* (N521SW), Amarillo, TX. Aircraft departed ramp pavement and became stuck. Deplaned passengers on airstrairs door.
- [Incident 19911121056859I](https://openairdocs.org/incident/19911121056859I), Nov 21, 1991: Boeing 7375H4 (N521SW), Los Angeles, CA. Encountered a bomb threat while taxiing for takeoff. Emergency evactuation. No bomb found.

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