AA1509
AA1509 (American Airlines) is a multi-stop service on 3 routes, busiest Boston to Chicago. Of 635 departures recorded from October 2024 to July 2026, 91.8% left on time, according to the US BTS.
- On-time departures91.8%of 635 flights
- Average delay4.7 min
- July 202631▲ 3.3%vs July 2025
- Cancelled0.6%
- Legs flown under this number3
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 | 30 | 31 | ▲ 3.3% |
| February | 26 | 28 | ▲ 7.7% |
| March | 26 | 31 | ▲ 19.2% |
| April | 30 | 30 | 0.0% |
| May | 31 | 31 | 0.0% |
| June | 30 | 30 | 0.0% |
| July | 30 | 31 | ▲ 3.3% |
| August | 31 | – | – |
| September | 27 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 203 | 212 | ▲ 4.4% |
according to the US BTS · October 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 | 93.3% | 73.3% | ▼ 21.4% |
| February | 88.0% | 89.3% | ▲ 1.5% |
| March | 100.0% | 90.3% | ▼ 9.7% |
| April | 93.1% | 96.7% | ▲ 3.8% |
| May | 96.8% | 93.6% | ▼ 3.3% |
| June | 100.0% | 90.0% | ▼ 10.0% |
| July | 93.3% | 93.6% | ▲ 0.2% |
| August | 96.7% | – | – |
| September | 85.2% | – | – |
| October | 96.8% | – | in progress |
| November | 86.7% | – | – |
| December | 83.9% | – | – |
| Year-to-date average (Jan–Jul) | 94.9% | 89.5% | ▼ 5.7% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 1 | – |
| February | 1 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 2 | 1 | ▼ 50.0% |
according to the US BTS · October 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 99.4% 631
- Cancelled 0.6% 4
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BOS ORD Boston Logan International Airport – Chicago O'Hare International Airport | 1,391 | -0.1 min | 94.3% | 456 |
| CLE MIA Cleveland Hopkins International Airport – Miami International Airport | 1,742 | 17.6 min | 85.8% | 156 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 38 | 38 | 89.5% | 0 |
| November 2024 | 8 | 8 | 100.0% | 0 |
| December 2024 | 24 | 24 | 95.8% | 0 |
| January 2025 | 30 | 30 | 93.3% | 0 |
| February 2025 | 26 | 25 | 88.0% | 1 |
| March 2025 | 26 | 26 | 100.0% | 0 |
| April 2025 | 30 | 29 | 93.1% | 1 |
| May 2025 | 31 | 31 | 96.8% | 0 |
| June 2025 | 30 | 30 | 100.0% | 0 |
| July 2025 | 30 | 30 | 93.3% | 0 |
| August 2025 | 31 | 30 | 96.7% | 1 |
| September 2025 | 27 | 27 | 85.2% | 0 |
| October 2025 | 31 | 31 | 96.8% | 0 |
| November 2025 | 30 | 30 | 86.7% | 0 |
| December 2025 | 31 | 31 | 83.9% | 0 |
| January 2026 | 31 | 30 | 73.3% | 1 |
| February 2026 | 28 | 28 | 89.3% | 0 |
| March 2026 | 31 | 31 | 90.3% | 0 |
| April 2026 | 30 | 30 | 96.7% | 0 |
| May 2026 | 31 | 31 | 93.6% | 0 |
| June 2026 | 30 | 30 | 90.0% | 0 |
| July 2026 | 31 | 31 | 93.6% | 0 |