AA1239
AA1239 (American Airlines) is a multi-stop service on 16 routes, busiest Boston to Chicago. Of 640 departures recorded from November 2024 to July 2026, 86.9% left on time, according to the US BTS.
- On-time departures86.9%of 640 flights
- Average delay7.8 min
- July 202631▲ 0.0%vs July 2025
- Cancelled1.1%
- Legs flown under this number16
Recorded departures by month
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 28 | 30 | ▲ 7.1% |
| February | 24 | 26 | ▲ 8.3% |
| March | 30 | 31 | ▲ 3.3% |
| April | 30 | 30 | 0.0% |
| May | 30 | 31 | ▲ 3.3% |
| June | 30 | 30 | 0.0% |
| July | 31 | 31 | 0.0% |
| August | 31 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 36 | – | – |
| December | 33 | – | – |
| Year to date (Jan–Jul) | 203 | 209 | ▲ 3.0% |
according to the US BTS · November 2024 → July 2026
On-time departures by month
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 81.5% | 82.1% | ▲ 0.8% |
| February | 87.5% | 84.6% | ▼ 3.3% |
| March | 86.7% | 90.3% | ▲ 4.2% |
| April | 80.0% | 83.3% | ▲ 4.2% |
| May | 86.7% | 93.6% | ▲ 7.9% |
| June | 90.0% | 96.7% | ▲ 7.4% |
| July | 93.6% | 96.6% | ▲ 3.2% |
| August | 83.9% | – | – |
| September | 90.0% | – | – |
| October | 87.1% | – | in progress |
| November | 70.6% | – | – |
| December | 84.9% | – | – |
| Year-to-date average (Jan–Jul) | 86.6% | 89.6% | ▲ 3.5% |
according to the US BTS · November 2024 → July 2026
Average departure delay by month
according to the US BTS · November 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 2 | ▲ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 2 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 4 | ▲ 300.0% |
according to the US BTS · November 2024 → July 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 98.9% 633
- Cancelled 1.1% 7
Share of all recorded flights in the period, all legs. · Nov 6, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
5| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS ORD Boston Logan International Airport – Chicago O'Hare International Airport | 1,391 | 3.0 min | 92.1% | 282 |
| IAH DFW George Bush Intercontinental Airport – Dallas Fort Worth International Airport | 362 | 13.6 min | 84.0% | 75 |
| LAX BOS Los Angeles International Airport – Boston Logan International Airport | 4,193 | 24.6 min | 82.4% | 36 |
| SAT DFW San Antonio International Airport – Dallas Fort Worth International Airport | 398 | 6.3 min | 86.7% | 30 |
| CLT FLL Charlotte Douglas International Airport – Fort Lauderdale Hollywood International Airport | 1,019 | 5.0 min | 86.7% | 30 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| November 2024 | 24 | 24 | 100.0% | 0 |
| December 2024 | 43 | 43 | 81.4% | 0 |
| January 2025 | 28 | 27 | 81.5% | 1 |
| February 2025 | 24 | 24 | 87.5% | 0 |
| March 2025 | 30 | 30 | 86.7% | 0 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 30 | 30 | 86.7% | 0 |
| June 2025 | 30 | 30 | 90.0% | 0 |
| July 2025 | 31 | 31 | 93.6% | 0 |
| August 2025 | 31 | 31 | 83.9% | 0 |
| September 2025 | 30 | 30 | 90.0% | 0 |
| October 2025 | 31 | 31 | 87.1% | 0 |
| November 2025 | 36 | 34 | 70.6% | 2 |
| December 2025 | 33 | 33 | 84.9% | 0 |
| January 2026 | 30 | 28 | 82.1% | 2 |
| February 2026 | 26 | 26 | 84.6% | 0 |
| March 2026 | 31 | 31 | 90.3% | 0 |
| April 2026 | 30 | 30 | 83.3% | 0 |
| May 2026 | 31 | 31 | 93.6% | 0 |
| June 2026 | 30 | 30 | 96.7% | 0 |
| July 2026 | 31 | 29 | 96.6% | 2 |