Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A0A91E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14120 · BOEING 757-200 · operated by UNITED AIRLINES INC, ATTN TREASURER

Hex
A0A91E
Octal
50124436
Decimal
10,529,054
Country
US
Tail
N14120
Type
B752
Broadcasting now · callsign UAL138 · 37,000 ft
Flights observed
321
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Current position

A0A91E is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0A91E falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 20 distinct

Callsign Airline Flights Last seen
UAL310 - 12 2026-07-03
UAL398 - 10 2026-07-18
UAL317 - 10 2026-07-08
UAL311 - 10 2026-07-03
UAL419 - 8 2026-07-06
UAL399 - 8 2026-07-17
UAL228 - 7 2026-06-23
UAL270 United Airlines 6 2026-07-22
UAL239 United Airlines 6 2026-07-26
UAL2308 - 6 2026-07-11
UAL2191 - 6 2026-07-12
UAL1626 United Airlines 6 2026-04-23
UAL1558 United Airlines 6 2026-07-25
UAL145 - 6 2026-07-05
UAL144 - 6 2026-07-05
UAL1340 - 6 2026-07-05
UAL979 - 5 2026-06-27
UAL648 - 5 2026-06-29
UAL316 - 5 2026-07-08
UAL288 United Airlines 5 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2788 DEN → EWR Jul 26, 19:15 UTCJul 26, 21:05 UTC1h 50m
2026-07-26 UAL239 ORD → BNA Jul 26, 08:25 UTCJul 26, 15:00 UTC6h 35m
2026-07-26 UAL239 ORD → BNA Jul 26, 08:10 UTCJul 26, 08:45 UTC35m
2026-07-25 UAL238 CLE → ORD Jul 25, 23:05 UTCJul 26, 05:40 UTC6h 35m
2026-07-25 UAL1149 EWR → SRQ Jul 25, 14:25 UTCJul 25, 19:25 UTC5h 0m
2026-07-25 UAL1149 EWR → SRQ Jul 25, 14:00 UTCJul 25, 14:05 UTC5m
2026-07-25 UAL1558 SNA → IAH Jul 25, 01:00 UTCJul 25, 06:20 UTC5h 20m
2026-07-24 UAL2759 IAD → EWR Jul 24, 19:10 UTCJul 24, 20:45 UTC1h 35m
2026-07-24 UAL289 EWR → RDU Jul 24, 08:40 UTCJul 24, 16:15 UTC7h 35m
2026-07-24 UAL288 DCA → ORD Jul 24, 00:10 UTCJul 24, 06:30 UTC6h 20m
2026-07-23 UAL119 ORD → EDI Jul 23, 11:05 UTCJul 23, 19:10 UTC8h 5m
2026-07-23 UAL118 ORD → EDI Jul 23, 02:15 UTCJul 23, 09:20 UTC7h 5m
2026-07-22 UAL661 ORD → EWR Jul 22, 21:05 UTCJul 22, 23:00 UTC1h 55m
2026-07-22 UAL271 - Jul 22, 11:40 UTCJul 22, 18:25 UTC6h 45m
2026-07-22 UAL270 EUG → SFO Jul 22, 03:40 UTCJul 22, 05:10 UTC1h 30m
2026-07-21 UAL2227 MFR → SFO Jul 21, 20:45 UTCJul 22, 01:50 UTC5h 5m
2026-07-21 UAL2227 MFR → SFO Jul 21, 20:33 UTCJul 22, 02:28 UTC5h 55m
2026-07-20 UAL2641 - Jul 20, 22:10 UTCJul 21, 03:20 UTC5h 9m
2026-07-18 UAL139 EWR → KEF Jul 18, 19:00 UTCJul 18, 19:15 UTC15m
2026-07-18 UAL139 EWR → KEF Jul 18, 17:10 UTCJul 18, 17:30 UTC20m
2026-07-18 UAL139 - Jul 18, 11:15 UTCJul 18, 15:30 UTC4h 15m
2026-07-18 UAL139 EWR → KEF Jul 18, 11:19 UTCJul 18, 16:54 UTC5h 35m
2026-07-18 UAL398 IAD → KEF Jul 18, 03:00 UTCJul 18, 08:35 UTC5h 35m
2026-07-17 UAL399 - Jul 17, 11:39 UTCJul 17, 17:30 UTC5h 50m
2026-07-17 UAL398 IAD → KEF Jul 17, 03:39 UTCJul 17, 08:59 UTC5h 20m
2026-07-16 UAL399 KEF → IAD Jul 16, 11:49 UTCJul 16, 17:10 UTC5h 21m
2026-07-16 UAL399 - Jul 16, 11:25 UTCJul 16, 11:40 UTC15m
2026-07-16 UAL398 IAD → KEF Jul 16, 03:00 UTCJul 16, 08:20 UTC5h 20m
2026-07-15 UAL2277 ORD → IAD Jul 15, 18:30 UTCJul 15, 19:29 UTC59m
2026-07-15 UAL2277 - Jul 15, 18:10 UTCJul 15, 19:30 UTC1h 20m
2026-07-14 UAL289 - Jul 14, 14:00 UTCJul 14, 21:20 UTC7h 20m
2026-07-14 UAL288 EWR → SNN Jul 14, 07:12 UTCJul 14, 12:20 UTC5h 8m
2026-07-14 UAL288 - Jul 14, 06:30 UTCJul 14, 12:25 UTC5h 55m
2026-07-13 UAL1597 SFO → EWR Jul 13, 20:32 UTCJul 14, 01:29 UTC4h 57m
2026-07-13 UAL1597 SFO → EWR Jul 13, 20:30 UTCJul 14, 01:30 UTC5h 0m
2026-07-13 UAL1777 - Jul 13, 12:25 UTCJul 13, 17:25 UTC5h 0m
2026-07-13 UAL1700 - Jul 13, 01:45 UTCJul 13, 06:35 UTC4h 50m
2026-07-12 UAL2191 EWR → LAX Jul 12, 19:23 UTCJul 12, 23:54 UTC4h 31m
2026-07-12 UAL2191 - Jul 12, 19:05 UTCJul 13, 00:01 UTC4h 55m
2026-07-12 UAL37 - Jul 12, 09:00 UTCJul 12, 16:01 UTC7h 0m
2026-07-12 UAL36 EWR → EDI Jul 12, 00:38 UTCJul 12, 07:06 UTC6h 28m
2026-07-12 UAL36 EWR → EDI Jul 12, 01:00 UTCJul 12, 07:10 UTC6h 10m
2026-07-11 UAL1283 DEN → EWR Jul 11, 18:55 UTCJul 11, 22:35 UTC3h 40m
2026-07-11 UAL2308 - Jul 11, 05:40 UTCJul 11, 11:50 UTC6h 10m
2026-07-11 UAL2308 LIH → DEN Jul 11, 05:45 UTCJul 11, 11:49 UTC6h 4m
2026-07-10 UAL2307 - Jul 10, 18:30 UTCJul 11, 01:25 UTC6h 55m
2026-07-10 UAL2308 - Jul 10, 05:50 UTCJul 10, 12:05 UTC6h 15m
2026-07-10 UAL2308 LIH → DEN Jul 10, 05:45 UTCJul 10, 12:00 UTC6h 15m
2026-07-09 UAL2307 - Jul 9, 18:20 UTCJul 10, 01:15 UTC6h 55m
2026-07-08 UAL663 - Jul 8, 23:55 UTCJul 9, 03:40 UTC3h 45m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N14120 page for operator, model, and routing details .

Mode-S A0A91E frequently asked

What is Mode-S code A0A91E?
A0A91E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14120.
Where is Mode-S A0A91E registered?
Mode-S code A0A91E is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A0A91E broadcasting right now?
Yes. Mode-S A0A91E is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A91E, octal 50124436, decimal 10,529,054.
What flights does A0A91E operate?
Mode-S A0A91E has broadcast 20 distinct callsigns, including UAL310, UAL398, UAL317, UAL311, UAL419.