Flight Reliability
AA 4721 · American Airlines
Boston → New York (BOS–JFK)86% of its flights flew this route. The rest (DCA–ORF, ORF–DCA) are included in these numbers.
- 76%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 3.6%
- Cancelled
- 9 min early
- Median arrival delay
Based on 361 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
AA 4721 departing between 3–6 PM arrived on time 81% of the time, versus 56% between 6–9 PM.
Sunday scaries are real for this one.
AA 4721 arrived on time 82% of the time on Fridays. On Sundays: 69%.
Keep a backup plan handy.
AA 4721 was cancelled 3.6% of the time. Typical for U.S. flights is around 1–2%.
Recent months have been rougher.
AA 4721 arrived on time 71% of the time over the last three months in the data, compared with 82% in the three months before that.
The breakdown
- Mon80%(50 flights)
- Tue75%(51 flights)
- Wed77%(51 flights)
- Thu71%(49 flights)
- Fri82%(51 flights)
- Sat79%(48 flights)
- Sun69%(48 flights)
- 9 AM–12 PM77%(184 flights)
- 12–3 PM79%(116 flights)
- 3–6 PM81%(21 flights)
- 6–9 PM56%(27 flights)
Jun 81% → May 71% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 81% | 26 |
| July 2025 | 87% | 31 |
| August 2025 | 69% | 45 |
| September 2025 | 78% | 32 |
| October 2025 | 73% | 30 |
| November 2025 | 75% | 28 |
| December 2025 | 82% | 22 |
| January 2026 | 79% | 24 |
| February 2026 | 84% | 25 |
| March 2026 | 68% | 31 |
| April 2026 | 73% | 30 |
| May 2026 | 71% | 24 |
- Departures on time
- 77%
- Diverted
- 0%
- Flights flown
- 348
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 361 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.