Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC66D5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N899AT · BOEING 717-200 · operated by DELTA AIR LINES INC

Hex
AC66D5
Octal
53063325
Decimal
11,298,517
Country
US
Tail
N899AT
Type
B712
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
684
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S AC66D5.

Country allocation

The ICAO 24-bit address AC66D5 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
DAL2826 - 19 2026-07-15
DAL940 Delta Air Lines 12 2026-07-26
DAL2862 Delta Air Lines 10 2026-07-22
DAL3030 - 9 2026-06-18
DAL3096 Delta Air Lines 8 2026-07-25
DAL2741 - 8 2026-07-13
DAL2684 Delta Air Lines 8 2026-07-24
DAL2480 - 8 2026-07-10
DAL3183 Delta Air Lines 7 2026-07-26
DAL3173 Delta Air Lines 7 2026-06-14
DAL2737 Delta Air Lines 7 2026-05-31
DAL2341 - 7 2026-07-05
DAL1391 - 7 2026-07-11
DAL854 Delta Air Lines 6 2026-05-22
DAL3012 Delta Air Lines 6 2026-04-25
DAL2563 - 6 2026-07-21
DAL2402 - 6 2026-07-14
DAL2370 Delta Air Lines 6 2026-07-24
DAL2331 - 6 2026-07-09
DAL2184 Delta Air Lines 6 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 DAL3050 ATL → GSO Jul 26, 20:35 UTCJul 26, 21:15 UTC40m
2026-07-26 DAL940 LAX → TPA Jul 26, 18:50 UTCJul 26, 19:25 UTC35m
2026-07-26 DAL940 LAX → TPA Jul 26, 17:00 UTCJul 26, 17:40 UTC40m
2026-07-26 DAL3183 JAN → ATL Jul 26, 14:50 UTCJul 26, 15:45 UTC55m
2026-07-26 DAL3117 ATL → JAN Jul 26, 01:05 UTCJul 26, 01:40 UTC35m
2026-07-25 DAL2467 FLL → BOS Jul 25, 22:05 UTCJul 25, 22:50 UTC45m
2026-07-25 DAL2467 FLL → BOS Jul 25, 20:15 UTCJul 25, 20:50 UTC35m
2026-07-25 DAL3096 ATL → LEX Jul 25, 18:00 UTCJul 25, 18:55 UTC55m
2026-07-25 DAL3096 ATL → LEX Jul 25, 17:55 UTCJul 25, 18:57 UTC1h 2m
2026-07-25 DAL3096 ATL → LEX Jul 25, 16:05 UTCJul 25, 16:50 UTC45m
2026-07-25 DAL1619 DTW → TPA Jul 25, 13:00 UTCJul 25, 13:30 UTC30m
2026-07-25 DAL1561 RSW → CVG Jul 25, 00:25 UTCJul 25, 01:40 UTC1h 15m
2026-07-24 DAL1343 ATL → MSP Jul 24, 21:52 UTCJul 24, 22:32 UTC40m
2026-07-24 DAL1343 ATL → MSP Jul 24, 20:00 UTCJul 24, 20:50 UTC50m
2026-07-24 DAL2684 LGA → MCO Jul 24, 17:30 UTCJul 24, 18:40 UTC1h 10m
2026-07-24 DAL2684 LGA → MCO Jul 24, 14:45 UTCJul 24, 16:05 UTC1h 20m
2026-07-24 DAL2370 ATL → TLH Jul 24, 11:40 UTCJul 24, 13:00 UTC1h 20m
2026-07-24 DAL2370 ATL → TLH Jul 24, 11:38 UTCJul 24, 12:57 UTC1h 19m
2026-07-23 DAL2384 GEG → SEA Jul 23, 23:25 UTCJul 24, 00:10 UTC45m
2026-07-23 DAL2539 FLL → CVG Jul 23, 20:30 UTCJul 23, 21:15 UTC45m
2026-07-23 DAL2539 FLL → CVG Jul 23, 20:25 UTCJul 23, 21:21 UTC56m
2026-07-23 DAL2539 FLL → CVG Jul 23, 18:25 UTCJul 23, 19:15 UTC50m
2026-07-23 DAL3064 MCI → ATL Jul 23, 16:30 UTCJul 23, 17:10 UTC40m
2026-07-23 DAL3064 MCI → ATL Jul 23, 14:40 UTCJul 23, 15:15 UTC35m
2026-07-23 DAL3155 AUS → DTW Jul 23, 11:40 UTCJul 23, 12:40 UTC1h 0m
2026-07-23 DAL3178 ATL → GPT Jul 23, 02:00 UTCJul 23, 02:50 UTC50m
2026-07-22 DAL2862 ATL → OKC Jul 22, 22:15 UTCJul 22, 23:55 UTC1h 40m
2026-07-22 DAL2862 ATL → OKC Jul 22, 19:35 UTCJul 22, 21:15 UTC1h 40m
2026-07-22 DAL1637 ATL → MSP Jul 22, 16:15 UTCJul 22, 18:00 UTC1h 45m
2026-07-22 DAL1637 ATL → MSP Jul 22, 16:12 UTCJul 22, 17:55 UTC1h 43m
2026-07-22 DAL1637 ATL → MSP Jul 22, 13:30 UTCJul 22, 15:15 UTC1h 45m
2026-07-22 DAL1255 TPA → SLC Jul 22, 11:10 UTCJul 22, 11:55 UTC45m
2026-07-22 DAL1283 YWG → MSP Jul 22, 02:05 UTCJul 22, 04:20 UTC2h 15m
2026-07-21 DAL3083 VPS → ATL Jul 21, 22:25 UTCJul 21, 23:05 UTC40m
2026-07-21 DAL3083 VPS → ATL Jul 21, 22:09 UTCJul 21, 22:54 UTC45m
2026-07-21 DAL3083 VPS → ATL Jul 21, 20:15 UTCJul 21, 21:00 UTC45m
2026-07-21 DAL940 LAX → TPA Jul 21, 18:05 UTCJul 21, 18:50 UTC45m
2026-07-21 DAL940 LAX → TPA Jul 21, 16:20 UTCJul 21, 16:55 UTC35m
2026-07-21 DAL2563 - Jul 21, 14:25 UTCJul 21, 15:00 UTC35m
2026-07-21 DAL2563 TLH → ATL Jul 21, 14:19 UTCJul 21, 15:01 UTC42m
2026-07-21 DAL2563 - Jul 21, 12:35 UTCJul 21, 13:10 UTC35m
2026-07-21 DAL1727 ATL → PVD Jul 21, 10:40 UTCJul 21, 11:20 UTC40m
2026-07-21 DAL1727 ATL → PVD Jul 21, 10:36 UTCJul 21, 11:16 UTC40m
2026-07-21 DAL1569 SEA → LAX Jul 21, 01:50 UTCJul 21, 02:30 UTC40m
2026-07-21 DAL1569 SEA → LAX Jul 21, 01:48 UTCJul 21, 02:29 UTC41m
2026-07-20 DAL1516 JFK → RSW Jul 20, 23:45 UTCJul 21, 00:25 UTC40m
2026-07-20 DAL1516 JFK → RSW Jul 20, 23:43 UTCJul 21, 00:20 UTC37m
2026-07-20 DAL1516 JFK → RSW Jul 20, 22:10 UTCJul 20, 22:50 UTC40m
2026-07-20 DAL2517 MDT → ATL Jul 20, 19:05 UTCJul 20, 20:30 UTC1h 25m
2026-07-20 DAL2517 MDT → ATL Jul 20, 19:05 UTCJul 20, 20:31 UTC1h 26m

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 N899AT page for operator, model, and routing details .

Mode-S AC66D5 frequently asked

What is Mode-S code AC66D5?
AC66D5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N899AT.
Where is Mode-S AC66D5 registered?
Mode-S code AC66D5 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 AC66D5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC66D5, octal 53063325, decimal 11,298,517.
What flights does AC66D5 operate?
Mode-S AC66D5 has broadcast 20 distinct callsigns, including DAL2826, DAL940, DAL2862, DAL3030, DAL3096.