Schedule: a typical Thursday (the flights of Jul 30, 2026, re-dated). Real flights replace these once the FAA publishes them, usually about a day ahead.
AMERICAN · FLIGHT AA 1239SCHEDULED · TYPICAL SCHEDULE
Tomorrow
AA 1239 · BOS → ORD
departs 8:58 AM ET · arrives 11:00 AM CT
Forecast issued Wed 2:00 AM ET · 31h before departure
Odds over time
Arrive at ORD more than 15 minutes late?
15%chance · ±4 pts+1 pt · 24h
HOW SURE WE AREModerate. The odds now blend history with early weather forecasts.
How late will it get to ORD?
On time or early
84%
15–30 min late
<1%
30 min–1 hour late
10%
1–2 hours late
3%
Over 2 hours late
2%
Cancelled
1%
Gate arrival compared with the scheduled arrival. The ranges add up to 100%.