Apparatus

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sensors Mode-S transponder

A3900E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N329DD · operated by AMERICAN AIRLINES INC

Hex
A3900E
Octal
50710016
Decimal
10,719,246
Country
US
Tail
N329DD
Type
E75L
Broadcasting now · callsign ENY3697 · 3,250 ft
Flights observed
754
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:50 UTC

Current position

A3900E is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A3900E 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
ENY4230 - 9 2026-06-21
ENY4010 - 9 2026-06-13
ENY3912 - 8 2026-06-16
ENY3478 - 8 2026-07-19
ENY4009 - 7 2026-06-16
ENY3825 - 7 2026-06-12
ENY3823 Envoy Air 7 2026-06-12
ENY3697 Envoy Air 7 2026-05-05
ENY3641 - 7 2026-06-27
ENY3538 - 7 2026-06-23
ENY4171 - 6 2026-07-11
ENY4140 Envoy Air 6 2026-07-25
ENY3532 - 6 2026-07-17
ENY3464 - 6 2026-06-28
ENY3409 - 6 2026-07-09
ENY3383 Envoy Air 6 2026-05-05
ENY4128 Envoy Air 5 2026-07-02
ENY4123 Envoy Air 5 2026-05-01
ENY3807 - 5 2026-07-11
ENY3791 - 5 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3407 ABI → DFW Jul 26, 18:10 UTCJul 26, 19:50 UTC1h 40m
2026-07-26 ENY3407 ABI → DFW Jul 26, 15:40 UTCJul 26, 16:55 UTC1h 15m
2026-07-26 ENY3894 CVG → ORD Jul 26, 13:20 UTCJul 26, 14:15 UTC55m
2026-07-25 ENY3408 MEM → ORD Jul 25, 22:35 UTCJul 26, 00:25 UTC1h 50m
2026-07-25 ENY3470 MDT → ORD Jul 25, 19:50 UTCJul 25, 21:15 UTC1h 25m
2026-07-25 ENY3470 MDT → ORD Jul 25, 19:45 UTCJul 25, 21:15 UTC1h 30m
2026-07-25 ENY3470 MDT → ORD Jul 25, 17:00 UTCJul 25, 18:35 UTC1h 35m
2026-07-25 ENY4106 ORD → BOS Jul 25, 13:40 UTCJul 25, 15:30 UTC1h 50m
2026-07-25 ENY3587 AVP → ORD Jul 25, 10:15 UTCJul 25, 11:45 UTC1h 30m
2026-07-25 ENY4140 LEX → ORD Jul 25, 02:40 UTCJul 25, 03:55 UTC1h 15m
2026-07-24 ENY3559 CWA → ORD Jul 24, 23:25 UTCJul 25, 00:50 UTC1h 25m
2026-07-24 ENY3559 CWA → ORD Jul 24, 23:20 UTCJul 25, 00:49 UTC1h 29m
2026-07-24 ENY3559 CWA → ORD Jul 24, 21:00 UTCJul 24, 22:20 UTC1h 20m
2026-07-24 ENY4135 STL → ORD Jul 24, 17:30 UTCJul 24, 18:55 UTC1h 25m
2026-07-24 ENY4135 STL → ORD Jul 24, 14:55 UTCJul 24, 16:25 UTC1h 30m
2026-07-24 ENY3413 BOS → ORD Jul 24, 12:00 UTCJul 24, 13:30 UTC1h 30m
2026-07-24 ENY3413 BOS → ORD Jul 24, 11:55 UTCJul 24, 13:25 UTC1h 30m
2026-07-24 ENY3754 MIA → GSO Jul 24, 01:45 UTCJul 24, 03:25 UTC1h 40m
2026-07-24 ENY3754 MIA → GSO Jul 24, 01:44 UTCJul 24, 03:20 UTC1h 36m
2026-07-23 ENY3605 BNA → TPA Jul 23, 23:45 UTCJul 24, 00:45 UTC1h 0m
2026-07-23 ENY3605 BNA → TPA Jul 23, 21:55 UTCJul 23, 22:45 UTC50m
2026-07-23 ENY3339 AGU → DFW Jul 23, 20:10 UTCJul 23, 20:45 UTC35m
2026-07-23 ENY3339 AGU → DFW Jul 23, 18:10 UTCJul 23, 18:25 UTC15m
2026-07-23 ENY3515 DFW → MTY Jul 23, 15:40 UTCJul 23, 16:00 UTC20m
2026-07-23 ENY3515 DFW → MTY Jul 23, 14:05 UTCJul 23, 14:25 UTC20m
2026-07-23 ENY3405 DCA → BGR Jul 23, 11:00 UTCJul 23, 12:35 UTC1h 35m
2026-07-23 ENY4042 DCA → CMH Jul 23, 00:50 UTCJul 23, 02:15 UTC1h 25m
2026-07-22 ENY3594 AUS → RDU Jul 22, 22:05 UTCJul 22, 22:50 UTC45m
2026-07-22 ENY3594 AUS → RDU Jul 22, 20:25 UTCJul 22, 21:05 UTC40m
2026-07-22 ENY3355 BOS → CMH Jul 22, 18:25 UTCJul 22, 18:55 UTC30m
2026-07-22 ENY3355 BOS → CMH Jul 22, 18:09 UTCJul 22, 18:54 UTC45m
2026-07-22 ENY3355 BOS → CMH Jul 22, 16:45 UTCJul 22, 17:05 UTC20m
2026-07-22 ENY3609 SJT → DFW Jul 22, 14:05 UTCJul 22, 15:00 UTC55m
2026-07-22 ENY3609 SJT → DFW Jul 22, 12:10 UTCJul 22, 13:00 UTC50m
2026-07-22 ENY3876 EIS → MIA Jul 22, 03:05 UTCJul 22, 03:50 UTC45m
2026-07-22 ENY3558 TRI → DFW Jul 22, 00:35 UTCJul 22, 02:05 UTC1h 30m
2026-07-21 ENY3557 CMH → DFW Jul 21, 21:10 UTCJul 21, 23:00 UTC1h 50m
2026-07-21 ENY4066 RNO → PHX Jul 21, 17:35 UTCJul 21, 19:35 UTC2h 0m
2026-07-21 ENY4066 RNO → PHX Jul 21, 17:23 UTCJul 21, 19:51 UTC2h 28m
2026-07-21 ENY4066 RNO → PHX Jul 21, 11:10 UTCJul 21, 11:45 UTC35m
2026-07-21 ENY4064 - Jul 21, 01:20 UTCJul 21, 03:25 UTC2h 5m
2026-07-20 ENY3678 ABQ → AUS Jul 20, 22:35 UTCJul 20, 23:35 UTC1h 0m
2026-07-20 ENY3678 ABQ → AUS Jul 20, 20:25 UTCJul 20, 21:30 UTC1h 5m
2026-07-20 ENY3661 DFW → SGF Jul 20, 17:30 UTCJul 20, 18:35 UTC1h 5m
2026-07-20 ENY3661 DFW → SGF Jul 20, 17:25 UTCJul 20, 18:38 UTC1h 13m
2026-07-20 ENY3661 DFW → SGF Jul 20, 15:15 UTCJul 20, 16:20 UTC1h 5m
2026-07-20 ENY3673 - Jul 20, 11:10 UTCJul 20, 13:15 UTC2h 5m
2026-07-20 ENY3673 ATW → DFW Jul 20, 11:05 UTCJul 20, 13:11 UTC2h 6m
2026-07-20 ENY4188 DFW → ATW Jul 20, 02:15 UTCJul 20, 04:20 UTC2h 5m
2026-07-20 ENY4188 DFW → ATW Jul 20, 02:11 UTCJul 20, 04:18 UTC2h 7m

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 N329DD page for operator, model, and routing details .

Mode-S A3900E frequently asked

What is Mode-S code A3900E?
A3900E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N329DD.
Where is Mode-S A3900E registered?
Mode-S code A3900E 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 A3900E broadcasting right now?
Yes. Mode-S A3900E is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3900E, octal 50710016, decimal 10,719,246.
What flights does A3900E operate?
Mode-S A3900E has broadcast 20 distinct callsigns, including ENY4230, ENY4010, ENY3912, ENY3478, ENY4009.