Enter two US airport codes.
| Grade | Flight | Leaves | On time | Cancelled | When late |
|---|
How is the grade computed?
- On time means BTS recorded the arrival less than 15 minutes after schedule.
- The grade is on-time arrivals divided by every flight scheduled. A cancelled or diverted flight counts as scheduled and not on time.
- A is 90% or more, B is 80%, C is 70%, D is 60%, F is below 60%.
- A flight with fewer than 20 scheduled flights in the window gets no letter. One with fewer than 5 is not listed.
- "Leaves" is the scheduled local departure on the latest date counted. Schedules change; the flight number is what is graded.
What does it not cover?
- International flights, and airlines that do not report to BTS.
- The newest two months or so. BTS publishes each month about two months after it ends.
- Regional flights under the number on your ticket. BTS files these under the airline that flew the plane, so a flight sold by a large airline and flown by a regional partner appears under the partner's code.
- Safety, turbulence, price or the ride from the airport. This room counts arrivals and nothing else.
Where does the data come from?
The BTS Reporting Carrier On-Time Performance files, one per month, read by open code once a week. The counts behind every grade are in the table, so each one can be recomputed by hand.