Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A977D4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N709UW · AIRBUS A-319 · operated by UMB BANK NA TRUSTEE

Hex
A977D4
Octal
52273724
Decimal
11,106,260
Country
US
Tail
N709UW
Type
A319
Transponder active on ground
Flights observed
678
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A977D4.

Country allocation

The ICAO 24-bit address A977D4 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
AAL3135 - 9 2026-07-15
AAL2713 American Airlines 9 2026-05-04
AAL2916 - 8 2026-06-17
AAL2354 - 8 2026-07-14
AAL1441 American Airlines 8 2026-06-11
AAL949 - 7 2026-06-17
AAL2448 - 7 2026-06-24
AAL2447 - 7 2026-07-15
AAL1572 American Airlines 7 2026-07-22
AAL3025 American Airlines 6 2026-05-02
AAL3015 American Airlines 6 2026-05-17
AAL2816 - 6 2026-06-17
AAL2116 American Airlines 6 2026-04-15
AAL1733 American Airlines 6 2026-07-19
AAL3188 American Airlines 5 2026-05-03
AAL2839 American Airlines 5 2026-06-08
AAL2714 - 5 2026-06-18
AAL2147 - 5 2026-07-17
AAL2131 American Airlines 5 2026-07-21
AAL1990 - 5 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2406 DFW → MSP Jul 26, 19:55 UTCJul 26, 21:35 UTC1h 40m
2026-07-26 AAL9785 BOS → JFK Jul 26, 16:25 UTCJul 26, 18:00 UTC1h 35m
2026-07-26 AAL9785 BOS → JFK Jul 26, 16:22 UTCJul 26, 17:53 UTC1h 31m
2026-07-26 AAL2349 RIC → DFW Jul 26, 14:00 UTCJul 26, 14:55 UTC55m
2026-07-26 AAL2349 RIC → DFW Jul 26, 13:55 UTCJul 26, 14:53 UTC58m
2026-07-26 AAL2349 RIC → DFW Jul 26, 11:25 UTCJul 26, 12:20 UTC55m
2026-07-25 AAL2533 DFW → PHL Jul 25, 23:40 UTCJul 26, 01:25 UTC1h 45m
2026-07-25 AAL2533 DFW → PHL Jul 25, 20:50 UTCJul 25, 22:25 UTC1h 35m
2026-07-25 AAL2001 SEA → PHL Jul 25, 17:55 UTCJul 25, 18:50 UTC55m
2026-07-25 AAL2001 SEA → PHL Jul 25, 17:54 UTCJul 25, 18:51 UTC57m
2026-07-25 AAL2001 SEA → PHL Jul 25, 15:50 UTCJul 25, 16:45 UTC55m
2026-07-25 AAL2273 CLT → RSW Jul 25, 11:45 UTCJul 25, 13:55 UTC2h 10m
2026-07-25 AAL2273 CLT → RSW Jul 25, 11:40 UTCJul 25, 13:48 UTC2h 8m
2026-07-25 AAL768 CLT → OKC Jul 25, 02:55 UTCJul 25, 04:55 UTC2h 0m
2026-07-24 AAL2151 DCA → LGA Jul 24, 22:55 UTCJul 25, 01:00 UTC2h 5m
2026-07-24 AAL2151 DCA → LGA Jul 24, 19:40 UTCJul 24, 21:55 UTC2h 15m
2026-07-24 AAL2154 SAP → MIA Jul 24, 16:10 UTCJul 24, 18:05 UTC1h 55m
2026-07-24 AAL2154 SAP → MIA Jul 24, 12:45 UTCJul 24, 15:10 UTC2h 25m
2026-07-23 AAL2174 MIA → ORD Jul 23, 22:10 UTCJul 23, 23:40 UTC1h 30m
2026-07-23 AAL2174 MIA → ORD Jul 23, 18:45 UTCJul 23, 20:15 UTC1h 30m
2026-07-23 AAL2316 PIT → CLT Jul 23, 16:15 UTCJul 23, 17:30 UTC1h 15m
2026-07-23 AAL2316 PIT → CLT Jul 23, 13:55 UTCJul 23, 15:00 UTC1h 5m
2026-07-23 AAL1746 DCA → BGR Jul 23, 10:20 UTCJul 23, 11:50 UTC1h 30m
2026-07-22 AAL1572 YYZ → MIA Jul 22, 18:05 UTCJul 22, 21:00 UTC2h 55m
2026-07-22 AAL1572 YYZ → MIA Jul 22, 18:03 UTCJul 22, 20:52 UTC2h 49m
2026-07-22 AAL1714 PHL → CLT Jul 22, 03:30 UTCJul 22, 04:10 UTC40m
2026-07-22 AAL1714 PHL → CLT Jul 22, 03:25 UTCJul 22, 04:07 UTC42m
2026-07-21 AAL1367 SAN → PHL Jul 21, 23:10 UTCJul 22, 00:35 UTC1h 25m
2026-07-21 AAL1367 SAN → PHL Jul 21, 23:06 UTCJul 22, 00:34 UTC1h 28m
2026-07-21 AAL1367 SAN → PHL Jul 21, 20:30 UTCJul 21, 21:55 UTC1h 25m
2026-07-21 AAL2131 PHL → RSW Jul 21, 17:20 UTCJul 21, 18:40 UTC1h 20m
2026-07-21 AAL2131 PHL → RSW Jul 21, 14:15 UTCJul 21, 15:35 UTC1h 20m
2026-07-21 AAL2436 EWR → DFW Jul 21, 11:45 UTCJul 21, 12:15 UTC30m
2026-07-20 AAL2245 DFW → BDL Jul 20, 22:35 UTCJul 20, 22:55 UTC20m
2026-07-20 AAL1527 PLS → MIA Jul 20, 19:31 UTCJul 20, 20:53 UTC1h 22m
2026-07-20 AAL1527 PLS → MIA Jul 20, 16:35 UTCJul 20, 20:55 UTC4h 20m
2026-07-20 AAL1516 YUL → MIA Jul 20, 11:40 UTCJul 20, 14:45 UTC3h 5m
2026-07-20 AAL2666 - Jul 20, 00:10 UTCJul 20, 03:10 UTC3h 0m
2026-07-19 AAL1339 CLT → IND Jul 19, 14:35 UTCJul 19, 22:00 UTC7h 25m
2026-07-19 AAL1733 DFW → MKE Jul 19, 11:55 UTCJul 19, 12:35 UTC40m
2026-07-19 AAL1733 DFW → MKE Jul 19, 11:55 UTCJul 19, 12:35 UTC40m
2026-07-19 AAL1700 DFW → EWR Jul 19, 02:00 UTCJul 19, 02:40 UTC40m
2026-07-18 AAL2072 CLT → ORF Jul 18, 23:20 UTCJul 19, 00:00 UTC40m
2026-07-18 AAL2072 CLT → ORF Jul 18, 23:19 UTCJul 18, 23:58 UTC39m
2026-07-18 AAL2072 CLT → ORF Jul 18, 21:00 UTCJul 18, 21:40 UTC40m
2026-07-18 AAL2131 PHL → RSW Jul 18, 18:15 UTCJul 18, 19:35 UTC1h 20m
2026-07-18 AAL2131 PHL → RSW Jul 18, 15:15 UTCJul 18, 16:40 UTC1h 25m
2026-07-18 AAL2131 PHL → RSW Jul 18, 15:13 UTCJul 18, 16:52 UTC1h 39m
2026-07-18 AAL414 - Jul 18, 01:34 UTCJul 18, 13:50 UTC12h 16m
2026-07-17 AAL620 - Jul 17, 20:20 UTCJul 17, 20:55 UTC35m

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 N709UW page for operator, model, and routing details .

Mode-S A977D4 frequently asked

What is Mode-S code A977D4?
A977D4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N709UW.
Where is Mode-S A977D4 registered?
Mode-S code A977D4 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 A977D4 broadcasting right now?
Mode-S A977D4 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A977D4, octal 52273724, decimal 11,106,260.
What flights does A977D4 operate?
Mode-S A977D4 has broadcast 20 distinct callsigns, including AAL3135, AAL2713, AAL2916, AAL2354, AAL1441.