Apparatus

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sensors Mode-S transponder

A45091

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N3773D · BOEING 737-800 · operated by DELTA AIR LINES INC

Hex
A45091
Octal
51050221
Decimal
10,768,529
Country
US
Tail
N3773D
Type
B738
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
592
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A45091.

Country allocation

The ICAO 24-bit address A45091 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
DAL1522 Delta Air Lines 31 2026-07-21
DAL3149 Delta Air Lines 22 2026-07-26
DAL3164 Delta Air Lines 20 2026-06-05
DAL2832 Delta Air Lines 18 2026-06-05
DAL1695 Delta Air Lines 15 2026-06-03
DAL880 Delta Air Lines 14 2026-07-26
DAL1436 - 14 2026-07-21
DAL2945 Delta Air Lines 11 2026-07-21
DAL1481 Delta Air Lines 11 2026-05-22
DAL3092 Delta Air Lines 10 2026-07-24
DAL3048 Delta Air Lines 10 2026-07-24
DAL3054 Delta Air Lines 9 2026-04-23
DAL1619 Delta Air Lines 9 2026-07-26
DAL2902 Delta Air Lines 8 2026-07-25
DAL2211 - 8 2026-06-22
DAL1347 Delta Air Lines 8 2026-05-21
DAL511 - 7 2026-07-05
DAL3040 Delta Air Lines 7 2026-05-01
DAL1359 Delta Air Lines 7 2026-05-28
DAL3060 Delta Air Lines 6 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL880 SLC → MSO Jul 26, 20:05 UTCJul 26, 21:30 UTC1h 25m
2026-07-26 DAL3149 ATL → CVG Jul 26, 17:40 UTCJul 26, 18:45 UTC1h 5m
2026-07-26 DAL3149 ATL → CVG Jul 26, 15:25 UTCJul 26, 16:20 UTC55m
2026-07-26 DAL1619 DTW → TPA Jul 26, 13:00 UTCJul 26, 13:35 UTC35m
2026-07-25 DAL2319 MCI → DTW Jul 25, 23:25 UTCJul 25, 23:55 UTC30m
2026-07-25 DAL583 BDA → ATL Jul 25, 18:53 UTCJul 25, 21:31 UTC2h 38m
2026-07-25 DAL584 ATL → BDA Jul 25, 14:50 UTCJul 25, 21:30 UTC6h 40m
2026-07-25 DAL3018 GSO → ATL Jul 25, 10:15 UTCJul 25, 11:05 UTC50m
2026-07-25 DAL3005 ATL → GSO Jul 25, 04:05 UTCJul 25, 04:50 UTC45m
2026-07-25 DAL2902 IAD → ATL Jul 25, 01:20 UTCJul 25, 02:30 UTC1h 10m
2026-07-24 DAL2902 IAD → ATL Jul 24, 22:55 UTCJul 25, 00:15 UTC1h 20m
2026-07-24 DAL3092 VPS → ATL Jul 24, 20:30 UTCJul 24, 21:20 UTC50m
2026-07-24 DAL3092 VPS → ATL Jul 24, 16:30 UTCJul 24, 17:10 UTC40m
2026-07-24 DAL3092 VPS → ATL Jul 24, 16:30 UTCJul 24, 17:13 UTC43m
2026-07-24 DAL3048 - Jul 24, 14:20 UTCJul 24, 15:00 UTC40m
2026-07-24 DAL3048 - Jul 24, 12:10 UTCJul 24, 12:50 UTC40m
2026-07-24 DAL3018 GSO → ATL Jul 24, 09:35 UTCJul 24, 10:25 UTC50m
2026-07-24 DAL3005 ATL → GSO Jul 24, 02:55 UTCJul 24, 03:45 UTC50m
2026-07-23 DAL2902 IAD → ATL Jul 23, 23:40 UTCJul 24, 00:55 UTC1h 15m
2026-07-23 DAL2902 IAD → ATL Jul 23, 21:15 UTCJul 23, 22:30 UTC1h 15m
2026-07-23 DAL3092 VPS → ATL Jul 23, 18:45 UTCJul 23, 19:35 UTC50m
2026-07-23 DAL3092 VPS → ATL Jul 23, 18:43 UTCJul 23, 19:31 UTC48m
2026-07-23 DAL3092 VPS → ATL Jul 23, 16:25 UTCJul 23, 17:05 UTC40m
2026-07-23 DAL3048 - Jul 23, 14:25 UTCJul 23, 15:05 UTC40m
2026-07-23 DAL3048 - Jul 23, 14:20 UTCJul 23, 15:06 UTC46m
2026-07-23 DAL3048 - Jul 23, 12:20 UTCJul 23, 13:05 UTC45m
2026-07-23 DAL3105 IND → ATL Jul 23, 10:00 UTCJul 23, 11:00 UTC1h 0m
2026-07-22 DAL3120 IND → ATL Jul 22, 22:20 UTCJul 22, 23:25 UTC1h 5m
2026-07-22 DAL3060 GSO → ATL Jul 22, 19:10 UTCJul 22, 20:00 UTC50m
2026-07-22 DAL3060 GSO → ATL Jul 22, 19:08 UTCJul 22, 20:01 UTC53m
2026-07-22 DAL3060 GSO → ATL Jul 22, 17:05 UTCJul 22, 17:55 UTC50m
2026-07-22 DAL2232 DTW → GSP Jul 22, 14:30 UTCJul 22, 15:35 UTC1h 5m
2026-07-22 DAL2232 DTW → GSP Jul 22, 12:40 UTCJul 22, 13:25 UTC45m
2026-07-21 DAL2740 DEN → SEA Jul 21, 23:45 UTCJul 22, 01:45 UTC2h 0m
2026-07-21 DAL2738 ATL → ORD Jul 21, 20:20 UTCJul 21, 22:15 UTC1h 55m
2026-07-21 DAL1522 MSP → PHX Jul 21, 17:00 UTCJul 21, 18:10 UTC1h 10m
2026-07-21 DAL1522 MSP → PHX Jul 21, 16:56 UTCJul 21, 18:09 UTC1h 13m
2026-07-21 DAL1522 MSP → PHX Jul 21, 14:20 UTCJul 21, 15:40 UTC1h 20m
2026-07-21 DAL1436 - Jul 21, 10:40 UTCJul 21, 12:20 UTC1h 40m
2026-07-21 DAL2945 BNA → BOS Jul 21, 02:30 UTCJul 21, 04:25 UTC1h 55m
2026-07-21 DAL2902 IAD → ATL Jul 21, 00:00 UTCJul 21, 01:15 UTC1h 15m
2026-07-20 DAL2902 IAD → ATL Jul 20, 20:55 UTCJul 20, 22:20 UTC1h 25m
2026-07-20 DAL3092 VPS → ATL Jul 20, 18:40 UTCJul 20, 19:25 UTC45m
2026-07-20 DAL3092 VPS → ATL Jul 20, 16:30 UTCJul 20, 17:10 UTC40m
2026-07-20 DAL3048 - Jul 20, 14:25 UTCJul 20, 15:05 UTC40m
2026-07-20 DAL3048 - Jul 20, 14:20 UTCJul 20, 15:04 UTC44m
2026-07-20 DAL3048 - Jul 20, 12:10 UTCJul 20, 12:50 UTC40m
2026-07-20 DAL2740 - Jul 20, 03:00 UTCJul 20, 04:20 UTC1h 20m
2026-07-19 DAL2738 ATL → ORD Jul 19, 23:30 UTCJul 20, 01:10 UTC1h 40m
2026-07-19 DAL3149 ATL → CVG Jul 19, 20:50 UTCJul 19, 21:35 UTC45m

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 N3773D page for operator, model, and routing details .

Mode-S A45091 frequently asked

What is Mode-S code A45091?
A45091 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N3773D.
Where is Mode-S A45091 registered?
Mode-S code A45091 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 A45091 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A45091, octal 51050221, decimal 10,768,529.
What flights does A45091 operate?
Mode-S A45091 has broadcast 20 distinct callsigns, including DAL1522, DAL3149, DAL3164, DAL2832, DAL1695.