Apparatus

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sensors Mode-S transponder

A097E9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N13720 · BOEING 737-700 · operated by UNITED AIRLINES INC

Hex
A097E9
Octal
50113751
Decimal
10,524,649
Country
US
Tail
N13720
Type
B737
No current signal · last broadcast Jul 26, 20:30 UTC
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:30 UTC

Last known position

Most recent position reported by Mode-S A097E9.

Country allocation

The ICAO 24-bit address A097E9 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
UAL1853 - 9 2026-07-05
UAL752 - 7 2026-07-20
UAL661 United Airlines 7 2026-06-20
UAL654 United Airlines 6 2026-07-20
UAL410 - 6 2026-06-28
UAL2860 United Airlines 6 2026-07-23
UAL2214 - 6 2026-06-27
UAL1852 - 6 2026-07-05
UAL1725 - 6 2026-07-08
UAL1106 - 6 2026-07-06
UAL1089 - 6 2026-06-30
UAL2465 - 5 2026-07-18
UAL2454 - 5 2026-06-29
UAL2081 - 5 2026-07-13
UAL1888 United Airlines 5 2026-07-19
UAL1548 United Airlines 5 2026-06-09
UAL1381 - 5 2026-07-19
UAL1317 United Airlines 5 2026-04-23
UAL1200 - 5 2026-07-11
UAL1024 - 5 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1746 LIH → SFO Jul 26, 19:15 UTCJul 26, 20:30 UTC1h 15m
2026-07-26 UAL591 SEA → EWR Jul 26, 14:35 UTCJul 26, 16:35 UTC2h 0m
2026-07-25 UAL503 RDU → EWR Jul 25, 21:25 UTCJul 25, 23:25 UTC2h 0m
2026-07-24 UAL1316 EWR → MIA Jul 24, 22:40 UTCJul 25, 01:05 UTC2h 25m
2026-07-24 UAL2844 BWI → ORD Jul 24, 19:10 UTCJul 24, 21:25 UTC2h 15m
2026-07-24 UAL576 MIA → DEN Jul 24, 16:49 UTCJul 24, 17:26 UTC37m
2026-07-24 UAL576 MIA → DEN Jul 24, 16:45 UTCJul 24, 17:40 UTC55m
2026-07-24 UAL2805 EWR → HNL Jul 24, 14:30 UTCJul 24, 15:30 UTC1h 0m
2026-07-24 UAL2638 EWR → RSW Jul 24, 11:25 UTCJul 24, 13:00 UTC1h 35m
2026-07-24 UAL2160 PHX → SFO Jul 24, 01:40 UTCJul 24, 02:55 UTC1h 15m
2026-07-23 UAL2860 LGA → DEN Jul 23, 22:10 UTCJul 23, 23:40 UTC1h 30m
2026-07-23 UAL2860 LGA → DEN Jul 23, 22:06 UTCJul 23, 23:28 UTC1h 22m
2026-07-23 UAL1746 LIH → SFO Jul 23, 19:25 UTCJul 23, 20:45 UTC1h 20m
2026-07-23 UAL503 RDU → EWR Jul 23, 15:05 UTCJul 23, 17:15 UTC2h 10m
2026-07-23 UAL1186 DFW → ORD Jul 23, 11:20 UTCJul 23, 13:05 UTC1h 45m
2026-07-23 UAL1193 IAH → SFO Jul 23, 00:00 UTCJul 23, 01:40 UTC1h 40m
2026-07-22 UAL1941 IAD → EWR Jul 22, 20:20 UTCJul 22, 21:40 UTC1h 20m
2026-07-22 UAL374 EWR → PBI Jul 22, 16:10 UTCJul 22, 18:00 UTC1h 50m
2026-07-22 UAL382 ORD → DCA Jul 22, 13:50 UTCJul 22, 15:00 UTC1h 10m
2026-07-22 UAL1499 EWR → LAX Jul 22, 11:45 UTCJul 22, 12:30 UTC45m
2026-07-22 UAL8126 YYZ → RDU Jul 22, 02:00 UTCJul 22, 02:35 UTC35m
2026-07-22 UAL8204 ORD → SAT Jul 22, 00:00 UTCJul 22, 00:05 UTC5m
2026-07-21 UAL8204 ORD → SAT Jul 21, 22:20 UTCJul 22, 00:05 UTC1h 45m
2026-07-21 UAL8204 ORD → SAT Jul 21, 22:15 UTCJul 21, 23:45 UTC1h 30m
2026-07-21 UAL1928 IAH → MSY Jul 21, 19:55 UTCJul 21, 20:55 UTC1h 0m
2026-07-21 UAL374 EWR → PBI Jul 21, 16:30 UTCJul 21, 18:15 UTC1h 45m
2026-07-21 UAL382 ORD → DCA Jul 21, 13:55 UTCJul 21, 15:25 UTC1h 30m
2026-07-21 UAL1499 EWR → LAX Jul 21, 11:45 UTCJul 21, 12:30 UTC45m
2026-07-21 UAL1393 ORD → CID Jul 21, 01:50 UTCJul 21, 02:25 UTC35m
2026-07-20 UAL654 AUS → IAD Jul 20, 21:30 UTCJul 20, 23:00 UTC1h 30m
2026-07-20 UAL654 AUS → IAD Jul 20, 21:29 UTCJul 20, 23:06 UTC1h 37m
2026-07-20 UAL752 PWK → DCA Jul 20, 18:45 UTCJul 20, 20:05 UTC1h 20m
2026-07-20 UAL2032 LAX → SFO Jul 20, 14:30 UTCJul 20, 16:40 UTC2h 10m
2026-07-19 UAL2032 LAX → SFO Jul 19, 22:20 UTCJul 20, 16:40 UTC18h 20m
2026-07-19 UAL378 ORD → EWR Jul 19, 22:00 UTCJul 20, 00:15 UTC2h 15m
2026-07-19 UAL378 ORD → EWR Jul 19, 22:03 UTCJul 20, 00:32 UTC2h 29m
2026-07-19 UAL1888 LAX → EWR Jul 19, 18:15 UTCJul 19, 19:55 UTC1h 40m
2026-07-19 UAL1381 ORD → DCA Jul 19, 15:20 UTCJul 19, 16:40 UTC1h 20m
2026-07-19 UAL2638 JPN → ORD Jul 19, 11:25 UTCJul 19, 13:05 UTC1h 40m
2026-07-19 UAL2160 PHX → SFO Jul 19, 02:20 UTCJul 19, 03:40 UTC1h 20m
2026-07-18 UAL291 SAV → ORD Jul 18, 22:25 UTCJul 19, 00:25 UTC2h 0m
2026-07-18 UAL2631 - Jul 18, 16:25 UTCJul 18, 18:05 UTC1h 40m
2026-07-18 UAL2465 BNA → ORD Jul 18, 13:45 UTCJul 18, 14:55 UTC1h 10m
2026-07-18 UAL2063 PHL → ORD Jul 18, 04:55 UTCJul 18, 05:50 UTC55m
2026-07-18 UAL2860 - Jul 18, 02:45 UTCJul 18, 02:55 UTC11m
2026-07-18 UAL2860 - Jul 18, 02:09 UTCJul 18, 02:55 UTC46m
2026-07-18 UAL2860 - Jul 18, 01:15 UTCJul 18, 02:05 UTC50m
2026-07-18 UAL2860 MDT → ORD Jul 18, 01:09 UTCJul 18, 02:28 UTC1h 19m
2026-07-17 UAL1746 - Jul 17, 22:29 UTCJul 18, 00:04 UTC1h 35m
2026-07-17 UAL1746 ORD → MDT Jul 17, 21:54 UTCJul 17, 23:59 UTC2h 5m

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 N13720 page for operator, model, and routing details .

Mode-S A097E9 frequently asked

What is Mode-S code A097E9?
A097E9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N13720.
Where is Mode-S A097E9 registered?
Mode-S code A097E9 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 A097E9 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A097E9, octal 50113751, decimal 10,524,649.
What flights does A097E9 operate?
Mode-S A097E9 has broadcast 20 distinct callsigns, including UAL1853, UAL752, UAL661, UAL654, UAL410.