Apparatus

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sensors Mode-S transponder

A877D3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N645AE · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
A877D3
Octal
52073723
Decimal
11,040,723
Country
US
Tail
N645AE
Type
E145
No current signal · last broadcast 5d ago
Flights observed
747
Distinct callsigns
20
Country
US
Last broadcast
5d ago

Last known position

Most recent position reported by Mode-S A877D3.

Country allocation

The ICAO 24-bit address A877D3 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
PDT6003 Piedmont Airlines 9 2026-05-08
PDT5982 Piedmont Airlines 9 2026-05-30
PDT5900 Piedmont Airlines 9 2026-06-07
PDT5802 - 9 2026-07-02
PDT5792 - 9 2026-07-07
PDT5994 - 8 2026-06-20
PDT5946 - 8 2026-07-03
PDT5941 - 8 2026-07-06
PDT5924 - 8 2026-07-08
PDT6114 - 7 2026-07-09
PDT6065 - 7 2026-07-07
PDT6054 - 7 2026-06-23
PDT6051 Piedmont Airlines 7 2026-06-11
PDT6048 Piedmont Airlines 7 2026-06-11
PDT6026 - 7 2026-07-04
PDT6013 Piedmont Airlines 7 2026-04-16
PDT5838 - 7 2026-07-06
PDT5823 Piedmont Airlines 7 2026-06-02
PDT5811 - 7 2026-07-04
PDT6117 - 6 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-09 PDT5945 - Jul 9, 01:55 UTCJul 9, 02:15 UTC20m
2026-07-09 PDT6114 - Jul 9, 00:15 UTCJul 9, 01:05 UTC50m
2026-07-08 PDT6114 - Jul 8, 22:05 UTCJul 8, 23:00 UTC55m
2026-07-08 PDT5924 - Jul 8, 19:10 UTCJul 8, 19:55 UTC45m
2026-07-08 PDT5924 SYR → PHL Jul 8, 19:05 UTCJul 8, 19:51 UTC46m
2026-07-08 PDT5924 - Jul 8, 17:20 UTCJul 8, 18:00 UTC40m
2026-07-08 PDT5908 MHT → PHL Jul 8, 14:50 UTCJul 8, 16:05 UTC1h 15m
2026-07-08 PDT5799 - Jul 8, 13:25 UTCJul 8, 13:40 UTC15m
2026-07-08 PDT5799 CLT → GSP Jul 8, 13:23 UTCJul 8, 13:43 UTC20m
2026-07-08 PDT5872 - Jul 8, 09:25 UTCJul 8, 10:40 UTC1h 15m
2026-07-08 PDT5977 - Jul 8, 01:25 UTCJul 8, 02:35 UTC1h 10m
2026-07-07 PDT6065 - Jul 7, 22:25 UTCJul 7, 23:50 UTC1h 25m
2026-07-07 PDT6065 - Jul 7, 20:35 UTCJul 7, 21:50 UTC1h 15m
2026-07-07 PDT5844 - Jul 7, 18:05 UTCJul 7, 19:30 UTC1h 25m
2026-07-07 PDT5844 - Jul 7, 15:35 UTCJul 7, 16:40 UTC1h 5m
2026-07-07 PDT5793 - Jul 7, 13:40 UTCJul 7, 14:00 UTC20m
2026-07-07 PDT5793 GSO → CLT Jul 7, 13:37 UTCJul 7, 13:59 UTC22m
2026-07-07 PDT5793 - Jul 7, 12:10 UTCJul 7, 12:35 UTC25m
2026-07-07 PDT6004 - Jul 7, 09:25 UTCJul 7, 09:55 UTC30m
2026-07-07 PDT5893 - Jul 7, 03:20 UTCJul 7, 03:40 UTC20m
2026-07-07 PDT5792 - Jul 7, 01:25 UTCJul 7, 01:45 UTC20m
2026-07-07 PDT5792 AVL → CLT Jul 7, 01:20 UTCJul 7, 01:50 UTC30m
2026-07-06 PDT5792 - Jul 6, 23:55 UTCJul 7, 00:15 UTC20m
2026-07-06 PDT5941 - Jul 6, 20:25 UTCJul 6, 20:55 UTC30m
2026-07-06 PDT5941 TRI → CLT Jul 6, 20:19 UTCJul 6, 20:52 UTC33m
2026-07-06 PDT5941 - Jul 6, 19:05 UTCJul 6, 19:30 UTC25m
2026-07-06 PDT5838 - Jul 6, 16:10 UTCJul 6, 17:35 UTC1h 25m
2026-07-06 PDT5838 GPT → CLT Jul 6, 16:06 UTCJul 6, 17:30 UTC1h 24m
2026-07-06 PDT5838 - Jul 6, 14:00 UTCJul 6, 15:20 UTC1h 20m
2026-07-06 PDT5833 - Jul 6, 11:25 UTCJul 6, 12:25 UTC1h 0m
2026-07-06 PDT9977 - Jul 6, 01:55 UTCJul 6, 03:20 UTC1h 25m
2026-07-05 PDT5819 - Jul 5, 18:15 UTCJul 5, 18:35 UTC20m
2026-07-05 PDT5819 - Jul 5, 15:20 UTCJul 5, 15:40 UTC20m
2026-07-05 PDT5962 PHL → MHT Jul 5, 13:20 UTCJul 5, 14:00 UTC40m
2026-07-05 PDT5962 PHL → MHT Jul 5, 13:19 UTCJul 5, 14:18 UTC59m
2026-07-04 PDT5926 - Jul 4, 23:00 UTCJul 5, 00:10 UTC1h 10m
2026-07-04 PDT6028 - Jul 4, 18:55 UTCJul 4, 19:45 UTC50m
2026-07-04 PDT6028 ALB → PHL Jul 4, 18:52 UTCJul 4, 19:39 UTC47m
2026-07-04 PDT6026 PHL → ALB Jul 4, 15:40 UTCJul 4, 16:21 UTC41m
2026-07-04 PDT6026 - Jul 4, 15:40 UTCJul 4, 16:25 UTC45m
2026-07-04 PDT5928 - Jul 4, 12:25 UTCJul 4, 13:20 UTC55m
2026-07-04 PDT5943 - Jul 4, 04:20 UTCJul 4, 04:55 UTC35m
2026-07-04 PDT5811 - Jul 4, 01:45 UTCJul 4, 02:45 UTC1h 0m
2026-07-04 PDT5811 HSV → CLT Jul 4, 01:42 UTCJul 4, 02:43 UTC1h 1m
2026-07-03 PDT5811 - Jul 3, 23:00 UTCJul 4, 00:45 UTC1h 45m
2026-07-03 PDT5832 - Jul 3, 19:55 UTCJul 3, 21:00 UTC1h 5m
2026-07-03 PDT5832 - Jul 3, 17:50 UTCJul 3, 18:55 UTC1h 5m
2026-07-03 PDT5946 - Jul 3, 15:20 UTCJul 3, 15:45 UTC25m
2026-07-03 PDT5946 - Jul 3, 13:55 UTCJul 3, 14:20 UTC25m
2026-07-03 PDT5856 - Jul 3, 10:50 UTCJul 3, 11:20 UTC30m

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 N645AE page for operator, model, and routing details .

Mode-S A877D3 frequently asked

What is Mode-S code A877D3?
A877D3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N645AE.
Where is Mode-S A877D3 registered?
Mode-S code A877D3 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 A877D3 broadcasting right now?
No active broadcast right now. Last signal was 5d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A877D3, octal 52073723, decimal 11,040,723.
What flights does A877D3 operate?
Mode-S A877D3 has broadcast 20 distinct callsigns, including PDT6003, PDT5982, PDT5900, PDT5802, PDT5792.