Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A339B1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N307DU · AIRBUS A220-300 · operated by DELTA AIR LINES INC

Hex
A339B1
Octal
50634661
Decimal
10,697,137
Country
US
Tail
N307DU
Type
BCS3
No current signal · last broadcast Jun 11, 03:05 UTC
Flights observed
276
Distinct callsigns
20
Country
US
Last broadcast
Jun 11, 03:05 UTC

Last known position

Most recent position reported by Mode-S A339B1.

Country allocation

The ICAO 24-bit address A339B1 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
DAL1390 Delta Air Lines 7 2026-05-19
DAL2958 Delta Air Lines 6 2026-06-08
DAL2508 Delta Air Lines 6 2026-05-03
DAL1297 Delta Air Lines 6 2026-05-20
DAL1262 Delta Air Lines 6 2026-05-04
DAL1189 Delta Air Lines 6 2026-05-04
DAL1071 Delta Air Lines 6 2026-05-13
DAL878 Delta Air Lines 5 2026-04-17
DAL2098 Delta Air Lines 5 2026-05-20
DAL2054 Delta Air Lines 5 2026-04-15
DAL1989 Delta Air Lines 5 2026-04-28
DAL1412 Delta Air Lines 5 2026-05-28
DAL794 Delta Air Lines 4 2026-05-11
DAL2985 Delta Air Lines 4 2026-05-31
DAL2851 Delta Air Lines 4 2026-05-04
DAL2828 Delta Air Lines 4 2026-05-19
DAL2785 Delta Air Lines 4 2026-05-19
DAL2140 Delta Air Lines 4 2026-05-18
DAL2079 Delta Air Lines 4 2026-04-24
DAL2006 Delta Air Lines 4 2026-06-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-11 DAL2006 ATL → CMH Jun 11, 02:05 UTCJun 11, 02:54 UTC49m
2026-06-09 DAL2006 ATL → CMH Jun 9, 20:35 UTCJun 9, 20:55 UTC20m
2026-06-08 DAL2006 ATL → CMH Jun 8, 22:20 UTCJun 8, 23:10 UTC50m
2026-06-08 DAL2006 ATL → CMH Jun 8, 20:25 UTCJun 8, 21:15 UTC50m
2026-06-08 DAL2958 ATL → OMA Jun 8, 16:35 UTCJun 8, 18:45 UTC2h 10m
2026-06-08 DAL2958 ATL → OMA Jun 8, 13:00 UTCJun 8, 15:04 UTC2h 5m
2026-06-07 DAL1193 SLC → SJC Jun 7, 10:40 UTCJun 7, 12:56 UTC2h 16m
2026-06-07 DAL1193 SLC → SJC Jun 7, 10:45 UTCJun 7, 12:55 UTC2h 10m
2026-06-07 DAL2961 ATL → LEX Jun 7, 01:30 UTCJun 7, 03:30 UTC2h 0m
2026-06-06 DAL2107 SLC → AUS Jun 6, 08:20 UTCJun 6, 08:30 UTC10m
2026-06-05 DAL2107 SLC → AUS Jun 5, 20:00 UTCJun 5, 22:35 UTC2h 35m
2026-06-05 DAL2679 ATL → BDL Jun 5, 16:25 UTCJun 5, 18:40 UTC2h 15m
2026-06-05 DAL1554 BOS → CVG Jun 5, 14:15 UTCJun 5, 15:15 UTC1h 0m
2026-06-05 DAL1554 BOS → CVG Jun 5, 14:12 UTCJun 5, 15:11 UTC59m
2026-06-05 DAL2251 DTW → BDL Jun 5, 10:25 UTCJun 5, 12:15 UTC1h 50m
2026-06-05 DAL2426 EWR → MSP Jun 5, 00:10 UTCJun 5, 02:50 UTC2h 40m
2026-06-04 DAL1387 BOS → RDU Jun 4, 19:55 UTCJun 4, 22:20 UTC2h 25m
2026-06-04 DAL1387 BOS → RDU Jun 4, 19:51 UTCJun 4, 22:21 UTC2h 30m
2026-06-04 DAL1529 TPA → DTW Jun 4, 15:30 UTCJun 4, 18:25 UTC2h 55m
2026-06-04 DAL814 DTW → BDL Jun 4, 11:25 UTCJun 4, 13:55 UTC2h 30m
2026-06-04 DAL814 DTW → BDL Jun 4, 11:20 UTCJun 4, 13:50 UTC2h 30m
2026-06-04 DAL2543 ATL → CHA Jun 4, 01:45 UTCJun 4, 03:30 UTC1h 45m
2026-06-03 DAL2130 BOS → RDU Jun 3, 22:45 UTCJun 3, 23:40 UTC55m
2026-06-03 DAL2617 BOS → JFK Jun 3, 16:40 UTCJun 3, 19:05 UTC2h 25m
2026-06-02 DAL2930 MSP → LGA Jun 2, 23:35 UTCJun 3, 00:35 UTC1h 0m
2026-06-02 DAL2930 MSP → LGA Jun 2, 18:10 UTCJun 2, 22:00 UTC3h 50m
2026-06-02 DAL2271 CVG → RSW Jun 2, 15:00 UTCJun 2, 16:55 UTC1h 55m
2026-06-02 DAL1544 ATL → PBI Jun 2, 12:10 UTCJun 2, 13:20 UTC1h 10m
2026-06-02 DAL1544 ATL → PBI Jun 2, 12:08 UTCJun 2, 13:11 UTC1h 3m
2026-06-02 DAL2138 ATL → PWM Jun 2, 01:25 UTCJun 2, 02:25 UTC1h 0m
2026-06-01 DAL2503 SAN → SEA Jun 1, 21:55 UTCJun 2, 00:05 UTC2h 10m
2026-06-01 DAL2411 ATL → LGA Jun 1, 17:10 UTCJun 1, 19:50 UTC2h 40m
2026-06-01 DAL2411 ATL → LGA Jun 1, 17:10 UTCJun 1, 19:45 UTC2h 35m
2026-06-01 DAL1368 JFK → MIA Jun 1, 13:25 UTCJun 1, 16:05 UTC2h 40m
2026-06-01 DAL1567 ATL → PHL Jun 1, 01:00 UTCJun 1, 03:40 UTC2h 40m
2026-05-31 DAL2405 MSP → PHL May 31, 20:45 UTCMay 31, 23:30 UTC2h 45m
2026-05-31 DAL2985 JFK → ATL May 31, 17:35 UTCMay 31, 19:15 UTC1h 40m
2026-05-31 DAL2985 JFK → ATL May 31, 13:25 UTCMay 31, 15:25 UTC2h 0m
2026-05-30 DAL1404 JFK → JAX May 30, 20:45 UTCMay 30, 22:15 UTC1h 30m
2026-05-30 DAL1404 JFK → JAX May 30, 17:20 UTCMay 30, 18:45 UTC1h 25m
2026-05-30 DAL1417 JFK → FLL May 30, 12:30 UTCMay 30, 15:35 UTC3h 5m
2026-05-30 DAL2683 LAX → DTW May 30, 00:05 UTCMay 30, 02:30 UTC2h 25m
2026-05-29 DAL2671 DTW → TPA May 29, 20:00 UTCMay 29, 22:25 UTC2h 25m
2026-05-29 DAL2671 DTW → TPA May 29, 19:58 UTCMay 29, 22:15 UTC2h 17m
2026-05-29 DAL2099 ATL → BOS May 29, 15:05 UTCMay 29, 18:20 UTC3h 15m
2026-05-29 DAL370 KOA → LAX May 29, 11:05 UTCMay 29, 13:20 UTC2h 15m
2026-05-29 DAL2256 LGA → MSY May 29, 00:45 UTCMay 29, 04:05 UTC3h 20m
2026-05-28 DAL1412 MSP → SLC May 28, 21:50 UTCMay 28, 23:25 UTC1h 35m
2026-05-28 DAL1412 MSP → SLC May 28, 19:05 UTCMay 28, 20:45 UTC1h 40m
2026-05-28 DAL2105 DTW → GRR May 28, 12:15 UTCMay 28, 15:15 UTC3h 0m

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 N307DU page for operator, model, and routing details .

Mode-S A339B1 frequently asked

What is Mode-S code A339B1?
A339B1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N307DU.
Where is Mode-S A339B1 registered?
Mode-S code A339B1 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 A339B1 broadcasting right now?
No active broadcast right now. Last signal was Jun 11, 03:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A339B1, octal 50634661, decimal 10,697,137.
What flights does A339B1 operate?
Mode-S A339B1 has broadcast 20 distinct callsigns, including DAL1390, DAL2958, DAL2508, DAL1297, DAL1262.