Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight Aircraft

N21723

BOEING 737-700

Operated by UNITED AIRLINES INC

Tail number
N21723
Type
B737
Mode-S
A1D63D
Not currently tracked · last seen 6h ago
Flights observed
395 showing last 50
Avg flight time
2h 55m
Typical route
LAS → SFO
Last seen
6h ago

Last known area

Map centered near N21723's most recent activity.

Recent flights last 50

DateRouteTakeoffLandingDuration
2026-07-13 - Jul 13, 23:45 UTCJul 14, 03:10 UTC3h 25m
2026-07-13 IAH → BDL Jul 13, 23:48 UTCJul 14, 03:08 UTC3h 20m
2026-07-13 - Jul 13, 00:20 UTCJul 13, 02:15 UTC1h 55m
2026-07-13 BNA → IAH Jul 13, 00:09 UTCJul 13, 02:06 UTC1h 57m
2026-07-12 EWR → BNA Jul 12, 20:32 UTCJul 12, 22:22 UTC1h 50m
2026-07-12 - Jul 12, 20:35 UTCJul 12, 22:35 UTC2h 0m
2026-07-12 - Jul 12, 16:25 UTCJul 12, 18:55 UTC2h 30m
2026-07-12 EWR → SRQ Jul 12, 12:50 UTCJul 12, 15:15 UTC2h 25m
2026-07-12 - Jul 12, 04:30 UTCJul 12, 09:25 UTC4h 55m
2026-07-11 - Jul 11, 22:15 UTCJul 12, 03:15 UTC5h 0m
2026-07-11 SEA → EWR Jul 11, 14:45 UTCJul 11, 20:05 UTC5h 20m
2026-07-11 - Jul 11, 05:31 UTCJul 11, 10:50 UTC5h 20m
2026-07-10 - Jul 10, 23:05 UTCJul 11, 03:40 UTC4h 35m
2026-07-10 - Jul 10, 15:00 UTCJul 10, 18:40 UTC3h 40m
2026-07-10 - Jul 10, 11:30 UTCJul 10, 12:45 UTC1h 15m
2026-07-10 - Jul 10, 01:25 UTCJul 10, 03:45 UTC2h 20m
2026-07-09 - Jul 9, 20:05 UTCJul 9, 22:55 UTC2h 50m
2026-07-09 - Jul 9, 15:20 UTCJul 9, 18:05 UTC2h 45m
2026-07-09 IAH → YYZ Jul 9, 15:28 UTCJul 9, 18:03 UTC2h 35m
2026-07-09 - Jul 9, 11:45 UTCJul 9, 13:00 UTC1h 15m
2026-07-09 QRO → IAH Jul 9, 11:17 UTCJul 9, 12:59 UTC1h 42m
2026-07-09 - Jul 9, 00:25 UTCJul 9, 01:40 UTC1h 15m
2026-07-09 IAH → QRO Jul 9, 00:06 UTCJul 9, 02:05 UTC1h 59m
2026-07-08 - Jul 8, 19:20 UTCJul 8, 22:25 UTC3h 5m
2026-07-08 - Jul 8, 15:25 UTCJul 8, 18:05 UTC2h 40m
2026-07-08 - Jul 8, 13:10 UTCJul 8, 13:45 UTC35m
2026-07-08 IAH → MIA Jul 8, 13:10 UTCJul 8, 13:46 UTC36m
2026-07-08 - Jul 8, 03:20 UTCJul 8, 06:15 UTC2h 55m
2026-07-08 IAD → SAT Jul 8, 03:04 UTCJul 8, 06:14 UTC3h 10m
2026-07-07 AUS → IAD Jul 7, 22:05 UTCJul 8, 01:05 UTC3h 0m
2026-07-07 LAS → SFO Jul 7, 17:31 UTCJul 7, 20:30 UTC2h 59m
2026-07-07 LAS → SFO Jul 7, 17:35 UTCJul 7, 20:30 UTC2h 55m
2026-07-07 BOS → IAD Jul 7, 12:15 UTCJul 7, 15:40 UTC3h 25m
2026-07-06 SAN → ORD Jul 6, 23:25 UTCJul 7, 03:05 UTC3h 40m
2026-07-06 SAN → ORD Jul 6, 22:39 UTCJul 7, 03:02 UTC4h 23m
2026-07-06 - Jul 6, 20:00 UTCJul 6, 21:10 UTC1h 10m
2026-07-06 BDL → IAD Jul 6, 19:45 UTCJul 6, 21:13 UTC1h 28m
2026-07-06 IAD → BDL Jul 6, 17:10 UTCJul 6, 18:15 UTC1h 5m
2026-07-06 - Jul 6, 12:05 UTCJul 6, 15:00 UTC2h 55m
2026-07-06 - Jul 6, 00:10 UTCJul 6, 00:45 UTC35m
2026-07-05 - Jul 5, 21:00 UTCJul 5, 22:25 UTC1h 25m
2026-07-05 - Jul 5, 17:45 UTCJul 5, 21:15 UTC3h 30m
2026-07-05 IAH → QRO Jul 5, 17:45 UTCJul 5, 19:22 UTC1h 37m
2026-07-04 - Jul 4, 23:30 UTCJul 5, 16:00 UTC16h 30m
2026-07-04 - Jul 4, 19:30 UTCJul 4, 22:25 UTC2h 55m
2026-07-03 AUS → IAD Jul 3, 22:25 UTCJul 4, 01:15 UTC2h 50m
2026-07-03 LAS → SFO Jul 3, 17:31 UTCJul 3, 20:08 UTC2h 37m
2026-07-03 LAS → SFO Jul 3, 17:20 UTCJul 3, 20:15 UTC2h 55m
2026-07-03 - Jul 3, 12:35 UTCJul 3, 15:10 UTC2h 35m
2026-07-03 DFW → IAD Jul 3, 12:36 UTCJul 3, 15:08 UTC2h 32m

Specifications

Registration N21723
Aircraft type BOEING 737-700 (B737)
Operator UNITED AIRLINES INC
Mode-S code A1D63D · 50353075 (octal)

Looking for transponder-level data? View the Mode-S A1D63D page for country allocation, callsign history, and ADS-B signal details.

N21723 frequently asked

What type of aircraft is N21723?
N21723 is a BOEING 737-700 (ICAO type code B737).
Who operates N21723?
N21723 is operated by UNITED AIRLINES INC.
What is the Mode-S transponder code for N21723?
N21723 broadcasts on Mode-S (ICAO 24-bit) address A1D63D (octal 50353075). View the transponder page.
What route does N21723 typically fly?
N21723 most frequently flies between LAS and SFO based on observed flights.
Where is N21723 right now?
N21723 is not currently being tracked; last seen 6h ago.