Apparatus

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sensors Mode-S transponder

AD7639

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N967AT · BOEING 717-200 · operated by DELTA AIR LINES INC

Hex
AD7639
Octal
53273071
Decimal
11,367,993
Country
US
Tail
N967AT
Type
B712
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
659
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AD7639.

Country allocation

The ICAO 24-bit address AD7639 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
DAL3027 - 11 2026-07-05
DAL2577 Delta Air Lines 10 2026-07-22
DAL2480 Delta Air Lines 9 2026-07-23
DAL2868 Delta Air Lines 8 2026-07-26
DAL1369 Delta Air Lines 8 2026-07-12
DAL2220 - 7 2026-07-14
DAL3099 Delta Air Lines 6 2026-06-10
DAL3060 - 6 2026-04-17
DAL3012 - 6 2026-06-30
DAL2944 Delta Air Lines 6 2026-05-01
DAL2857 Delta Air Lines 6 2026-07-21
DAL2599 Delta Air Lines 6 2026-06-04
DAL1626 Delta Air Lines 6 2026-07-26
DAL1374 Delta Air Lines 6 2026-06-06
DAL731 Delta Air Lines 5 2026-06-07
DAL3202 - 5 2026-07-06
DAL3182 Delta Air Lines 5 2026-05-28
DAL3166 Delta Air Lines 5 2026-07-24
DAL3163 Delta Air Lines 5 2026-05-19
DAL3141 Delta Air Lines 5 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL3032 ATL → CAE Jul 26, 21:40 UTCJul 26, 22:15 UTC35m
2026-07-26 DAL1429 BOS → RSW Jul 26, 19:05 UTCJul 26, 20:15 UTC1h 10m
2026-07-26 DAL2868 ATL → SDF Jul 26, 16:00 UTCJul 26, 17:15 UTC1h 15m
2026-07-26 DAL2868 ATL → SDF Jul 26, 13:45 UTCJul 26, 14:50 UTC1h 5m
2026-07-26 DAL1626 MSP → MSY Jul 26, 11:35 UTCJul 26, 12:45 UTC1h 10m
2026-07-26 DAL1541 FLL → LGA Jul 26, 00:30 UTCJul 26, 01:35 UTC1h 5m
2026-07-25 DAL2814 BOS → BNA Jul 25, 21:50 UTCJul 25, 23:15 UTC1h 25m
2026-07-25 DAL2814 BOS → BNA Jul 25, 19:35 UTCJul 25, 20:50 UTC1h 15m
2026-07-25 DAL909 MSP → BOS Jul 25, 16:35 UTCJul 25, 18:15 UTC1h 40m
2026-07-25 DAL1119 MCO → CVG Jul 25, 13:00 UTCJul 25, 14:35 UTC1h 35m
2026-07-25 DAL1119 MCO → CVG Jul 25, 12:55 UTCJul 25, 14:33 UTC1h 38m
2026-07-25 DAL1540 JFK → TPA Jul 25, 10:20 UTCJul 25, 11:35 UTC1h 15m
2026-07-25 DAL2402 DTW → PHL Jul 25, 01:45 UTCJul 25, 02:50 UTC1h 5m
2026-07-24 DAL1787 MIA → HAV Jul 24, 23:09 UTCJul 25, 00:11 UTC1h 2m
2026-07-24 DAL1787 MIA → HAV Jul 24, 23:10 UTCJul 25, 00:15 UTC1h 5m
2026-07-24 DAL1787 MIA → HAV Jul 24, 19:35 UTCJul 24, 20:35 UTC1h 0m
2026-07-24 DAL1787 MIA → HAV Jul 24, 19:34 UTCJul 24, 20:29 UTC55m
2026-07-24 DAL3166 ATL → STL Jul 24, 16:55 UTCJul 24, 18:10 UTC1h 15m
2026-07-24 DAL3166 ATL → STL Jul 24, 16:49 UTCJul 24, 18:14 UTC1h 25m
2026-07-24 DAL3166 ATL → STL Jul 24, 14:35 UTCJul 24, 15:40 UTC1h 5m
2026-07-24 DAL1626 MSP → MSY Jul 24, 11:40 UTCJul 24, 12:45 UTC1h 5m
2026-07-24 DAL1541 FLL → LGA Jul 24, 00:15 UTCJul 24, 01:20 UTC1h 5m
2026-07-23 DAL2480 BWI → DTW Jul 23, 21:35 UTCJul 23, 22:45 UTC1h 10m
2026-07-23 DAL2480 BWI → DTW Jul 23, 19:15 UTCJul 23, 20:25 UTC1h 10m
2026-07-23 DAL2039 ORD → DTW Jul 23, 14:40 UTCJul 23, 15:25 UTC45m
2026-07-23 DAL1665 SLC → DFW Jul 23, 00:20 UTCJul 23, 01:20 UTC1h 0m
2026-07-23 DAL1665 SLC → DFW Jul 23, 00:16 UTCJul 23, 01:00 UTC44m
2026-07-22 DAL1343 ATL → MSP Jul 22, 22:05 UTCJul 22, 22:45 UTC40m
2026-07-22 DAL1343 ATL → MSP Jul 22, 22:03 UTCJul 22, 22:44 UTC41m
2026-07-22 DAL1343 ATL → MSP Jul 22, 20:00 UTCJul 22, 20:45 UTC45m
2026-07-22 DAL2577 TPA → BOS Jul 22, 17:15 UTCJul 22, 18:35 UTC1h 20m
2026-07-22 DAL2577 TPA → BOS Jul 22, 14:35 UTCJul 22, 15:45 UTC1h 10m
2026-07-22 DAL2577 TPA → BOS Jul 22, 14:31 UTCJul 22, 15:41 UTC1h 10m
2026-07-22 DAL3006 RSW → DTW Jul 22, 11:35 UTCJul 22, 13:10 UTC1h 35m
2026-07-22 DAL2034 SLC → SJC Jul 22, 03:10 UTCJul 22, 03:35 UTC25m
2026-07-21 DAL2857 MSP → ORD Jul 21, 23:15 UTCJul 22, 01:55 UTC2h 40m
2026-07-21 DAL2857 MSP → ORD Jul 21, 20:50 UTCJul 21, 22:20 UTC1h 30m
2026-07-21 DAL9984 ATL → ATL Jul 21, 00:55 UTCJul 21, 01:35 UTC40m
2026-07-15 DAL2516 - Jul 15, 10:15 UTCJul 15, 11:25 UTC1h 10m
2026-07-15 DAL1289 - Jul 15, 01:45 UTCJul 15, 02:50 UTC1h 5m
2026-07-14 DAL2220 - Jul 14, 23:20 UTCJul 15, 00:15 UTC55m
2026-07-14 DAL2220 - Jul 14, 21:20 UTCJul 14, 22:10 UTC50m
2026-07-14 DAL1640 - Jul 14, 19:00 UTCJul 14, 20:05 UTC1h 5m
2026-07-14 DAL1640 ATL → PNS Jul 14, 17:00 UTCJul 14, 17:45 UTC45m
2026-07-14 DAL376 - Jul 14, 14:35 UTCJul 14, 15:35 UTC1h 0m
2026-07-14 DAL0376 - Jul 14, 12:25 UTCJul 14, 13:15 UTC50m
2026-07-14 DAL2637 BNA → ATL Jul 14, 10:15 UTCJul 14, 10:55 UTC40m
2026-07-14 DAL3002 ATL → BNA Jul 14, 02:09 UTCJul 14, 02:51 UTC42m
2026-07-14 DAL3002 ATL → BNA Jul 14, 02:10 UTCJul 14, 02:55 UTC45m
2026-07-13 DAL1183 - Jul 13, 14:25 UTCJul 13, 15:30 UTC1h 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 N967AT page for operator, model, and routing details .

Mode-S AD7639 frequently asked

What is Mode-S code AD7639?
AD7639 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N967AT.
Where is Mode-S AD7639 registered?
Mode-S code AD7639 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 AD7639 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD7639, octal 53273071, decimal 11,367,993.
What flights does AD7639 operate?
Mode-S AD7639 has broadcast 20 distinct callsigns, including DAL3027, DAL2577, DAL2480, DAL2868, DAL1369.