Apparatus

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sensors Mode-S transponder

AB03A4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N809DN · BOEING 737-900 · operated by DELTA AIR LINES INC

Hex
AB03A4
Octal
52601644
Decimal
11,207,588
Country
US
Tail
N809DN
Type
B739
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AB03A4.

Country allocation

The ICAO 24-bit address AB03A4 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
DAL809 Delta Air Lines 9 2026-06-05
DAL3157 - 6 2026-07-12
DAL2739 - 6 2026-06-24
DAL2400 - 6 2026-06-30
DAL1004 Delta Air Lines 6 2026-07-24
DAL3105 Delta Air Lines 5 2026-07-25
DAL2755 Delta Air Lines 5 2026-05-12
DAL2208 - 5 2026-07-14
DAL1701 - 5 2026-06-29
DAL1380 - 5 2026-07-16
DAL1013 - 5 2026-07-17
DAL2695 Delta Air Lines 4 2026-05-11
DAL2612 Delta Air Lines 4 2026-05-11
DAL2510 Delta Air Lines 4 2026-06-30
DAL2437 - 4 2026-07-06
DAL2356 - 4 2026-07-08
DAL2302 - 4 2026-06-23
DAL1925 Delta Air Lines 4 2026-04-18
DAL1828 - 4 2026-06-27
DAL1699 - 4 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL1008 CVG → ATL Jul 26, 22:00 UTCJul 26, 23:00 UTC1h 0m
2026-07-26 DAL1008 CVG → ATL Jul 26, 19:30 UTCJul 26, 20:25 UTC55m
2026-07-26 DAL654 JFK → PHX Jul 26, 13:50 UTCJul 26, 18:05 UTC4h 15m
2026-07-26 DAL933 LGA → MCO Jul 26, 00:00 UTCJul 26, 04:30 UTC4h 30m
2026-07-25 DAL933 LGA → MCO Jul 25, 23:57 UTCJul 26, 04:24 UTC4h 27m
2026-07-25 DAL3014 ATL → BHM Jul 25, 21:45 UTCJul 25, 22:25 UTC40m
2026-07-25 DAL3014 ATL → BHM Jul 25, 19:50 UTCJul 25, 20:35 UTC45m
2026-07-25 DAL1147 ORD → ATL Jul 25, 16:35 UTCJul 25, 18:00 UTC1h 25m
2026-07-25 DAL1147 ORD → ATL Jul 25, 16:33 UTCJul 25, 17:56 UTC1h 23m
2026-07-25 DAL1147 ORD → ATL Jul 25, 13:15 UTCJul 25, 14:45 UTC1h 30m
2026-07-25 DAL3105 IND → ATL Jul 25, 10:25 UTCJul 25, 11:30 UTC1h 5m
2026-07-24 DAL2979 JFK → ATL Jul 24, 23:35 UTCJul 25, 00:55 UTC1h 20m
2026-07-24 DAL2979 JFK → ATL Jul 24, 23:33 UTCJul 25, 00:51 UTC1h 18m
2026-07-24 DAL1004 MIA → LGA Jul 24, 17:45 UTCJul 24, 20:35 UTC2h 50m
2026-07-24 DAL1004 MIA → LGA Jul 24, 13:15 UTCJul 24, 15:50 UTC2h 35m
2026-07-24 DAL1499 SLC → MSP Jul 24, 10:15 UTCJul 24, 11:25 UTC1h 10m
2026-07-24 DAL2997 ATL → SRQ Jul 24, 03:25 UTCJul 24, 04:35 UTC1h 10m
2026-07-24 DAL2199 MSP → PHL Jul 24, 00:15 UTCJul 24, 01:30 UTC1h 15m
2026-07-23 DAL558 BOS → SLC Jul 23, 18:55 UTCJul 23, 22:40 UTC3h 45m
2026-07-23 DAL2530 LGA → BOS Jul 23, 14:25 UTCJul 23, 16:40 UTC2h 15m
2026-07-23 DAL2672 ATL → DTW Jul 23, 03:05 UTCJul 23, 05:25 UTC2h 20m
2026-07-22 DAL871 SFO → ATL Jul 22, 23:30 UTCJul 23, 01:00 UTC1h 30m
2026-07-22 DAL849 ATL → BOS Jul 22, 20:45 UTCJul 22, 22:10 UTC1h 25m
2026-07-22 DAL672 SAN → JFK Jul 22, 14:38 UTCJul 22, 18:57 UTC4h 19m
2026-07-22 DAL672 SAN → JFK Jul 22, 14:40 UTCJul 22, 19:05 UTC4h 25m
2026-07-22 DAL1383 ATL → EWR Jul 22, 11:30 UTCJul 22, 12:25 UTC55m
2026-07-22 DAL1351 SJC → ATL Jul 22, 03:10 UTCJul 22, 04:30 UTC1h 20m
2026-07-21 DAL1109 ATL → LGA Jul 21, 22:50 UTCJul 22, 01:25 UTC2h 35m
2026-07-21 DAL1109 ATL → LGA Jul 21, 18:35 UTCJul 21, 21:20 UTC2h 45m
2026-07-21 DAL569 ATL → LGA Jul 21, 13:10 UTCJul 21, 17:10 UTC4h 0m
2026-07-20 DAL637 - Jul 20, 23:30 UTCJul 21, 03:50 UTC4h 19m
2026-07-20 DAL637 - Jul 20, 18:00 UTCJul 20, 21:20 UTC3h 20m
2026-07-20 DAL354 JFK → SLC Jul 20, 10:50 UTCJul 20, 15:55 UTC5h 5m
2026-07-20 DAL3244 ATL → RDU Jul 20, 03:30 UTCJul 20, 04:30 UTC1h 0m
2026-07-18 DAL904 SMF → ATL Jul 18, 19:30 UTCJul 19, 00:20 UTC4h 50m
2026-07-18 DAL904 ATL → SMF Jul 18, 19:30 UTCJul 19, 00:15 UTC4h 45m
2026-07-18 DAL904 ATL → SMF Jul 18, 13:25 UTCJul 18, 17:30 UTC4h 5m
2026-07-18 DAL1843 ATL → PVR Jul 18, 06:50 UTCJul 18, 10:40 UTC3h 50m
2026-07-18 DAL1843 ATL → PVR Jul 18, 01:25 UTCJul 18, 05:25 UTC4h 1m
2026-07-17 DAL1013 - Jul 17, 22:55 UTCJul 17, 23:39 UTC45m
2026-07-17 DAL1013 PNS → ATL Jul 17, 22:49 UTCJul 17, 23:42 UTC53m
2026-07-17 DAL1013 - Jul 17, 20:25 UTCJul 17, 21:00 UTC35m
2026-07-17 DAL1029 JFK → ATL Jul 17, 15:25 UTCJul 17, 17:05 UTC1h 40m
2026-07-16 DAL2398 ATL → JFK Jul 16, 23:29 UTCJul 17, 01:35 UTC2h 6m
2026-07-16 DAL2398 ATL → JFK Jul 16, 23:29 UTCJul 17, 01:45 UTC2h 15m
2026-07-16 DAL1196 RSW → ATL Jul 16, 19:55 UTCJul 16, 21:19 UTC1h 25m
2026-07-16 DAL1196 ATL → RSW Jul 16, 17:05 UTCJul 16, 18:19 UTC1h 15m
2026-07-16 DAL1380 - Jul 16, 14:25 UTCJul 16, 15:35 UTC1h 10m
2026-07-16 DAL1380 PIT → ATL Jul 16, 14:24 UTCJul 16, 15:31 UTC1h 7m
2026-07-16 DAL1380 - Jul 16, 11:50 UTCJul 16, 13:05 UTC1h 15m

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 N809DN page for operator, model, and routing details .

Mode-S AB03A4 frequently asked

What is Mode-S code AB03A4?
AB03A4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N809DN.
Where is Mode-S AB03A4 registered?
Mode-S code AB03A4 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 AB03A4 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB03A4, octal 52601644, decimal 11,207,588.
What flights does AB03A4 operate?
Mode-S AB03A4 has broadcast 20 distinct callsigns, including DAL809, DAL3157, DAL2739, DAL2400, DAL1004.