Flight profile · American Airlines
AA1509
Boston (BOS) to Chicago (ORD) · scheduled 7:00 AM – 9:05 AM
How AA1509 performs
873 operations, 2023-07-01 to 2026-06-30.
AA1509 arrived on time 91.1% of the time, against 77.1% for all BOS → ORD flights — this specific departure is 14.1 percentage points better than the route as a whole. Against American Airlines’s own flights on this route it is 14.0 points better.
Source: US DOT Bureau of Transportation Statistics · 873 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| AA1509 | 91.1% | 0.57% | -17 min | 3.5% | 873 |
| American Airlines on BOS → ORD | 77.1% | 1.91% | -10 min | 10.5% | 5,181 |
| All BOS → ORD flights | 77.1% | 1.92% | -7 min | 9.7% | 21,098 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does AA1509 run worse on particular days?
Tuesday is historically the most reliable day and Friday the least, a gap of 3.8 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes AA1509 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route AA1509 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 873 records of AA1509 operating BOS → ORD, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.