sensors Mode-S transponder
A1A0C4
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N2039J · AIRBUS A-321neo · operated by JETBLUE AIRWAYS CORP
- Hex
- A1A0C4
- Octal
- 50320304
- Decimal
- 10,592,452
- Country
- US
- Tail
- N2039J
- Type
- A21N
- Flights observed
- 133
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- 6h ago
Last known position
Country allocation
The ICAO 24-bit address A1A0C4 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 |
|---|---|---|---|
| JBU939 | JetBlue Airways | 8 | 2026-04-28 |
| JBU505 | JetBlue Airways | 8 | 2026-05-24 |
| JBU509 | JetBlue Airways | 7 | 2026-05-15 |
| JBU965 | JetBlue Airways | 6 | 2026-05-08 |
| JBU561 | JetBlue Airways | 6 | 2026-04-20 |
| JBU528 | JetBlue Airways | 6 | 2026-05-25 |
| JBU1329 | JetBlue Airways | 6 | 2026-05-11 |
| JBU938 | JetBlue Airways | 5 | 2026-04-16 |
| JBU610 | JetBlue Airways | 5 | 2026-05-16 |
| JBU1383 | JetBlue Airways | 5 | 2026-05-10 |
| JBU2709 | JetBlue Airways | 4 | 2026-05-07 |
| JBU966 | JetBlue Airways | 3 | 2026-05-18 |
| JBU710 | JetBlue Airways | 3 | 2026-05-27 |
| JBU2223 | JetBlue Airways | 3 | 2026-05-14 |
| JBU2210 | JetBlue Airways | 3 | 2026-05-15 |
| JBU1990 | JetBlue Airways | 3 | 2026-05-30 |
| JBU1902 | - | 3 | 2026-04-13 |
| JBU154 | JetBlue Airways | 3 | 2026-05-29 |
| JBU1133 | JetBlue Airways | 3 | 2026-05-29 |
| JBU97 | JetBlue Airways | 2 | 2026-04-24 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-05-30 | JBU1990 | SJU → EWR | May 30, 02:40 UTC | May 30, 03:30 UTC | 50m |
| 2026-05-29 | JBU1990 | SJU → EWR | May 29, 23:40 UTC | May 30, 00:00 UTC | 20m |
| 2026-05-29 | JBU1990 | SJU → EWR | May 29, 23:39 UTC | May 30, 03:35 UTC | 3h 57m |
| 2026-05-29 | JBU1133 | SYR → JFK | May 29, 19:05 UTC | May 29, 21:30 UTC | 2h 25m |
| 2026-05-29 | JBU154 | PBI → JFK | May 29, 02:00 UTC | May 29, 02:25 UTC | 25m |
| 2026-05-29 | JBU154 | PBI → JFK | May 29, 00:15 UTC | May 29, 00:30 UTC | 15m |
| 2026-05-29 | JBU154 | PBI → JFK | May 29, 00:10 UTC | May 29, 21:30 UTC | 21h 21m |
| 2026-05-28 | JBU1133 | SYR → JFK | May 28, 22:25 UTC | May 28, 22:45 UTC | 20m |
| 2026-05-28 | JBU1133 | SYR → JFK | May 28, 20:15 UTC | May 28, 20:50 UTC | 35m |
| 2026-05-28 | JBU499 | LGA → MCO | May 28, 15:20 UTC | May 28, 17:30 UTC | 2h 10m |
| 2026-05-28 | JBU172 | FLL → LGA | May 28, 11:15 UTC | May 28, 13:30 UTC | 2h 15m |
| 2026-05-27 | JBU710 | JAX → BOS | May 27, 15:35 UTC | May 28, 15:00 UTC | 23h 25m |
| 2026-05-27 | JBU710 | JAX → BOS | May 27, 10:30 UTC | May 27, 19:00 UTC | 8h 30m |
| 2026-05-27 | JBU2184 | RDU → BOS | May 27, 01:39 UTC | May 27, 03:45 UTC | 2h 5m |
| 2026-05-26 | JBU483 | EWR → SFO | May 26, 21:04 UTC | May 26, 22:59 UTC | 1h 55m |
| 2026-05-26 | JBU710 | JAX → BOS | May 26, 10:20 UTC | May 26, 18:50 UTC | 8h 30m |
| 2026-05-25 | JBU528 | MCO → EWR | May 25, 15:55 UTC | May 26, 03:35 UTC | 11h 39m |
| 2026-05-24 | JBU505 | EWR → FLL | May 24, 10:35 UTC | May 24, 14:30 UTC | 3h 55m |
| 2026-05-24 | JBU505 | EWR → FLL | May 24, 10:34 UTC | May 24, 20:45 UTC | 10h 12m |
| 2026-05-23 | JBU528 | MCO → EWR | May 23, 15:55 UTC | May 24, 03:50 UTC | 11h 55m |
| 2026-05-22 | JBU1256 | GYE → FLL | May 22, 18:24 UTC | May 23, 16:25 UTC | 22h 1m |
| 2026-05-22 | JBU505 | EWR → FLL | May 22, 10:16 UTC | May 22, 22:35 UTC | 12h 20m |
| 2026-05-21 | JBU2018 | MIA → BOS | May 21, 20:00 UTC | May 22, 14:05 UTC | 18h 6m |
| 2026-05-21 | JBU117 | BOS → ATL | May 21, 14:10 UTC | May 21, 21:40 UTC | 7h 30m |
| 2026-05-20 | JBU528 | MCO → EWR | May 20, 21:05 UTC | May 21, 17:30 UTC | 20h 26m |
| 2026-05-20 | JBU528 | MCO → EWR | May 20, 21:05 UTC | May 21, 17:30 UTC | 20h 26m |
| 2026-05-20 | JBU470 | FLL → BOS | May 20, 01:02 UTC | May 20, 17:05 UTC | 16h 4m |
| 2026-05-19 | JBU1256 | GYE → FLL | May 19, 17:22 UTC | May 20, 17:00 UTC | 23h 39m |
| 2026-05-19 | JBU505 | EWR → FLL | May 19, 09:35 UTC | May 19, 21:35 UTC | 12h 0m |
| 2026-05-18 | JBU966 | BOS → ATL | May 18, 14:25 UTC | May 19, 02:20 UTC | 11h 54m |
| 2026-05-18 | JBU264 | SEA → JFK | May 18, 07:10 UTC | May 18, 12:05 UTC | 4h 55m |
| 2026-05-17 | JBU263 | JFK → SEA | May 17, 22:10 UTC | May 18, 03:50 UTC | 5h 40m |
| 2026-05-16 | JBU887 | LGA → BNA | May 16, 16:11 UTC | May 16, 21:00 UTC | 4h 50m |
| 2026-05-16 | JBU610 | DFW → JFK | May 16, 11:04 UTC | May 17, 08:45 UTC | 21h 42m |
| 2026-05-15 | JBU2210 | JAX → BOS | May 15, 19:55 UTC | May 16, 14:25 UTC | 18h 31m |
| 2026-05-15 | JBU509 | BOS → SEA | May 15, 14:30 UTC | May 15, 15:25 UTC | 54m |
| 2026-05-15 | JBU509 | BOS → SEA | May 15, 14:30 UTC | May 16, 03:50 UTC | 13h 20m |
| 2026-05-14 | JBU1124 | LAX → JFK | May 14, 21:10 UTC | May 15, 02:15 UTC | 5h 5m |
| 2026-05-14 | JBU2223 | JFK → LAX | May 14, 13:10 UTC | May 14, 18:20 UTC | 5h 10m |
| 2026-05-13 | JBU528 | MCO → EWR | May 13, 21:25 UTC | May 14, 18:20 UTC | 20h 56m |
| 2026-05-13 | JBU528 | MCO → EWR | May 13, 21:25 UTC | May 14, 18:20 UTC | 20h 56m |
| 2026-05-13 | JBU1255 | FLL → GYE | May 13, 15:35 UTC | May 13, 17:25 UTC | 1h 50m |
| 2026-05-13 | JBU569 | BOS → FLL | May 13, 10:10 UTC | May 13, 13:20 UTC | 3h 10m |
| 2026-05-12 | JBU505 | EWR → FLL | May 12, 09:50 UTC | May 12, 13:40 UTC | 3h 50m |
| 2026-05-12 | JBU505 | EWR → FLL | May 12, 09:46 UTC | May 13, 04:10 UTC | 18h 25m |
| 2026-05-11 | JBU1329 | GUA → JFK | May 11, 20:20 UTC | May 11, 22:35 UTC | 2h 14m |
| 2026-05-11 | JBU1329 | GUA → JFK | May 11, 16:10 UTC | May 11, 18:25 UTC | 2h 15m |
| 2026-05-10 | JBU1383 | PWM → LGA | May 10, 18:49 UTC | May 10, 21:00 UTC | 2h 10m |
| 2026-05-10 | JBU1383 | PWM → LGA | May 10, 18:48 UTC | May 11, 16:40 UTC | 21h 52m |
| 2026-05-10 | JBU1383 | PWM → LGA | May 10, 16:59 UTC | May 10, 17:10 UTC | 10m |
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 N2039J page for operator, model, and routing details .