Schedule: the flights that flew on Tuesday, Sep 29, re-dated. Real flights replace these once airlines file their FAA flight plans, usually about a day ahead.

AMERICAN · FLIGHT AA 1421 SCHEDULED · TYPICAL SCHEDULE

Tuesday, October 6

AA 1421 · BOS → DCA

departs 6:06 PM ET · arrives 7:55 PM ET

Forecast issued Sun 6:00 AM ET · 60h before departure

Arrive at DCA more than 15 minutes late?

14% chance · ±4 pts – · 24h

HOW SURE WE ARE Moderate. The odds now blend history with early weather forecasts.

How late will it get to DCA?

On time or early
85%
15–30 min late
5%
30 min–1 hour late
3%
1–2 hours late
4%
Over 2 hours late
2%
Cancelled
<1%

Gate arrival compared with the scheduled arrival. The ranges add up to 100%.

What’s moving the odds

↑ 6pm departures from BOS are often late

↑ Arrivals into DCA at that hour are often late

↑ Later flights pick up delays from earlier in the day

↓ Tuesdays in October are usually quieter than average

↓ Mostly benign weather forecast at BOS

Weather at each end

BOS (origin) Gusts22 kt Ceilingnone (clear) Visibility10+ mi Precipnone

DCA (destination) Gusts10 kt Ceilingnone (clear) Visibility10+ mi Precipnone

How this resolves

Yes if the gate arrival is more than 15 minutes after the scheduled arrival. Cancelled or diverted flights resolve N/A.

Every question here is display only — there is no betting or money involved. Gate times come from the airline; a cancellation resolves only the “Cancelled?” question, and a diversion voids the delay questions.

AA 1421 · BOS → DCA

Odds over time

How late will it get to DCA?