About 1 in 5 AA 3866 flights from Dallas arrived 15+ minutes late, diverted or cancelled over the past year (20%); 5.9% were cancelled. The typical flight landed 10 minutes early.
AA 3866: DFW → GRK
Scheduled to leave Dallas at 9:05 a.m. local time, operated by Envoy as MQ 3866. Over the past year it arrived on time 80% of the time (188 flights), better than other AA flights on the route at that hour (71%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 27 | 89% |
| Tuesday | 27 | 89% |
| Wednesday | 28 | 75% |
| Thursday | 26 | 73% |
| Friday | 27 | 89% |
| Saturday | 28 | 75% |
| Sunday | 25 | 68% |
Why it was late
All flights DFW → GRK · Connecting off AA 3866? Check the risk
Questions
How often is AA 3866 from DFW to GRK late?
American Airlines 3866 from Dallas/Fort Worth, TX to Killeen, TX arrived 15 or more minutes late, was diverted or was cancelled on 20% of 188 scheduled flights between September 2025 and August 2026. 5.9% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check American Airlines for today's flight. Method.