FAA Aircraft Registry · Live Lookup · As of Apr 28, 2026
N21723 — Boeing 737-724
Rendered live from the FAA Aircraft Registry (refreshed weekly). This tail has no NTSB events or airworthiness directives indexed against it — type-level history is on the type page below.
Registration
Registrant
UNITED AIRLINES INC
Registrant Type
Corporation
Location
CHICAGO, IL
Status
Registration Valid
Certificate Issued
Apr 23, 1999
Airworthiness Date
Apr 21, 1999
Registration Expires
Jan 31, 2030
Last Action
Nov 3, 2025
Aircraft
Serial Number
28790
Year Manufactured
1999
Aircraft Type
Fixed Wing Multi Engine
Certification
Standard (+1 flag)
Engine
CFM INTL. CFM56 SERIES
Engines / Seats
2 / 149
Weight Class
CLASS 3
Mode S (Hex)
A1D63D
Type History
Boeing 737-724 type page → — 36 registered · 13 NTSB records · 0 airworthiness directives
Live position via ICAO24 A1D63D
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