Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A39AB4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N331NB · AIRBUS A-319 · operated by DELTA AIR LINES INC

Hex
A39AB4
Octal
50715264
Decimal
10,721,972
Country
US
Tail
N331NB
Type
A319
No current signal · last broadcast Jul 26, 21:00 UTC
Flights observed
570
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A39AB4.

Country allocation

The ICAO 24-bit address A39AB4 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
DAL1279 Delta Air Lines 32 2026-05-20
DAL1275 Delta Air Lines 26 2026-05-20
DAL1038 Delta Air Lines 18 2026-05-20
DAL1018 Delta Air Lines 15 2026-05-20
DAL1281 Delta Air Lines 8 2026-06-12
DAL2476 - 7 2026-06-29
DAL2455 Delta Air Lines 7 2026-06-06
DAL2314 - 7 2026-07-12
DAL2207 Delta Air Lines 7 2026-06-24
DAL1517 Delta Air Lines 7 2026-07-24
DAL1143 Delta Air Lines 7 2026-07-26
DAL946 Delta Air Lines 6 2026-06-07
DAL381 - 6 2026-07-01
DAL2855 - 6 2026-06-23
DAL2816 Delta Air Lines 6 2026-05-06
DAL2746 - 6 2026-07-02
DAL2316 Delta Air Lines 6 2026-07-02
DAL2002 Delta Air Lines 6 2026-06-08
DAL978 - 5 2026-07-02
DAL890 Delta Air Lines 5 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1143 ATL → HPN Jul 26, 17:50 UTCJul 26, 21:00 UTC3h 10m
2026-07-26 DAL2534 SLC → PDX Jul 26, 12:55 UTCJul 26, 15:20 UTC2h 25m
2026-07-25 DAL2568 SFO → MSP Jul 25, 17:00 UTCJul 25, 19:35 UTC2h 35m
2026-07-25 DAL1354 IAD → ATL Jul 25, 12:40 UTCJul 25, 15:30 UTC2h 50m
2026-07-25 DAL2243 JFK → MIA Jul 25, 01:30 UTCJul 25, 04:15 UTC2h 45m
2026-07-24 DAL1517 CLT → MSP Jul 24, 21:05 UTCJul 25, 00:00 UTC2h 55m
2026-07-24 DAL1517 CLT → MSP Jul 24, 16:50 UTCJul 24, 19:35 UTC2h 45m
2026-07-24 DAL1216 PBI → LGA Jul 24, 12:45 UTCJul 24, 15:50 UTC3h 5m
2026-07-24 DAL1287 LAX → IAH Jul 24, 02:00 UTCJul 24, 05:00 UTC3h 0m
2026-07-23 DAL1143 ATL → HPN Jul 23, 21:15 UTCJul 24, 00:05 UTC2h 50m
2026-07-23 DAL1143 ATL → HPN Jul 23, 21:12 UTCJul 24, 00:01 UTC2h 49m
2026-07-23 DAL1143 ATL → HPN Jul 23, 16:55 UTCJul 23, 19:50 UTC2h 55m
2026-07-23 DAL439 JFK → LAX Jul 23, 12:50 UTCJul 23, 15:25 UTC2h 35m
2026-07-23 DAL420 LAX → BOS Jul 23, 02:10 UTCJul 23, 04:50 UTC2h 40m
2026-07-22 DAL2588 MSP → EWR Jul 22, 22:00 UTCJul 23, 00:35 UTC2h 35m
2026-07-22 DAL2009 BOS → RSW Jul 22, 17:55 UTCJul 22, 19:45 UTC1h 50m
2026-07-21 DAL401 DFW → ATL Jul 21, 10:35 UTCJul 21, 12:15 UTC1h 40m
2026-07-21 DAL1207 DTW → DFW Jul 21, 00:55 UTCJul 21, 03:00 UTC2h 5m
2026-07-20 DAL2343 - Jul 20, 17:25 UTCJul 20, 18:45 UTC1h 20m
2026-07-20 DAL2343 JFK → DTW Jul 20, 17:21 UTCJul 20, 18:39 UTC1h 18m
2026-07-20 DAL2751 - Jul 20, 14:40 UTCJul 20, 16:00 UTC1h 20m
2026-07-20 DAL1389 IAH → DTW Jul 20, 10:40 UTCJul 20, 13:05 UTC2h 25m
2026-07-20 DAL1633 DTW → IAH Jul 20, 00:55 UTCJul 20, 03:15 UTC2h 20m
2026-07-20 DAL1633 DTW → IAH Jul 20, 00:52 UTCJul 20, 03:06 UTC2h 14m
2026-07-19 DAL645 - Jul 19, 19:05 UTCJul 19, 23:00 UTC3h 55m
2026-07-19 DAL645 MEX → DTW Jul 19, 19:03 UTCJul 19, 22:56 UTC3h 53m
2026-07-19 DAL646 DTW → MEX Jul 19, 13:50 UTCJul 19, 17:00 UTC3h 10m
2026-07-19 DAL646 DTW → MEX Jul 19, 13:49 UTCJul 19, 17:40 UTC3h 51m
2026-07-19 DAL2292 SYR → ATL Jul 19, 11:15 UTCJul 19, 11:55 UTC40m
2026-07-19 DAL2424 DTW → MSN Jul 19, 02:50 UTCJul 19, 03:20 UTC30m
2026-07-18 DAL2343 JFK → DTW Jul 18, 20:15 UTCJul 18, 21:50 UTC1h 35m
2026-07-18 DAL2751 - Jul 18, 14:35 UTCJul 18, 15:50 UTC1h 15m
2026-07-18 DAL2091 ATL → DAB Jul 18, 10:40 UTCJul 18, 11:40 UTC1h 0m
2026-07-18 DAL2097 - Jul 18, 01:05 UTCJul 18, 02:45 UTC1h 40m
2026-07-17 DAL2863 DCA → MSP Jul 17, 19:17 UTCJul 17, 21:31 UTC2h 14m
2026-07-17 DAL2863 DCA → MSP Jul 17, 19:20 UTCJul 17, 21:30 UTC2h 10m
2026-07-17 DAL2888 - Jul 17, 15:49 UTCJul 17, 17:50 UTC2h 0m
2026-07-17 DAL890 CLT → MSP Jul 17, 12:35 UTCJul 17, 14:10 UTC1h 35m
2026-07-17 DAL890 CLT → MSP Jul 17, 12:34 UTCJul 17, 14:08 UTC1h 34m
2026-07-16 DAL2992 - Jul 16, 22:35 UTCJul 17, 00:20 UTC1h 45m
2026-07-16 DAL2992 MIA → RDU Jul 16, 22:32 UTCJul 17, 00:15 UTC1h 43m
2026-07-16 DAL2576 - Jul 16, 18:50 UTCJul 16, 20:55 UTC2h 5m
2026-07-16 DAL2576 DCA → MIA Jul 16, 18:47 UTCJul 16, 20:48 UTC2h 1m
2026-07-16 DAL2983 MSP → DCA Jul 16, 15:35 UTCJul 16, 17:30 UTC1h 55m
2026-07-16 DAL1006 FSD → MSP Jul 16, 13:30 UTCJul 16, 14:05 UTC35m
2026-07-15 DAL2615 ATL → FSD Jul 15, 22:40 UTCJul 16, 00:45 UTC2h 5m
2026-07-15 DAL1866 MTY → ATL Jul 15, 18:30 UTCJul 15, 20:50 UTC2h 20m
2026-07-15 DAL1929 ATL → MTY Jul 15, 14:25 UTCJul 15, 16:52 UTC2h 27m
2026-07-15 DAL1929 ATL → MTY Jul 15, 14:30 UTCJul 15, 17:00 UTC2h 30m
2026-07-15 DAL950 - Jul 15, 02:10 UTCJul 15, 03:30 UTC1h 20m

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 N331NB page for operator, model, and routing details .

Mode-S A39AB4 frequently asked

What is Mode-S code A39AB4?
A39AB4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N331NB.
Where is Mode-S A39AB4 registered?
Mode-S code A39AB4 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 A39AB4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39AB4, octal 50715264, decimal 10,721,972.
What flights does A39AB4 operate?
Mode-S A39AB4 has broadcast 20 distinct callsigns, including DAL1279, DAL1275, DAL1038, DAL1018, DAL1281.