# N23721 — BOEING 737-724
> **1999** Fixed Wing Multi-Engine · Turbo-Fan · Owner: UNITED AIRLINES INC · CHICAGO, IL
## Aircraft
- **N-Number:** N23721
- **Serial Number:** 28940
- **Manufacturer:** BOEING
- **Model:** 737-724
- **Year manufactured:** 1999
- **Type:** Fixed Wing Multi-Engine
- **Engine type:** Turbo-Fan (02 engines)
- **Seats:** 149
- **Weight class:** CLASS 3
- **Mode S code (hex):** `A22539`
## Owner
- **Name:** UNITED AIRLINES INC
- **Type of registrant:** Corporation
- **Location:** CHICAGO, IL 606067147, US
## Registration
- **Status:** Valid
- **Certificate issued:** 1999-03-10
- **Last action:** 2023-09-09
- **Expiration:** 2029-10-31
## Source
- [FAA Aircraft Inquiry](https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=23721)
- [ADS-B Exchange live tracking](https://globe.adsbexchange.com/?icao=a22539)
---
*AI Analytics · CC0 1.0*