Skip to content
WanderNerd
Check a flight

Flight Reliability

AA 3521 · American Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and AA 3521 moved between routes during this period. Numbers below combine all of them, so treat them as background, not a verdict. For a cleaner answer, check the route you are actually flying.

Combined across all its routes

83%
Arrive within 15 minutes
2 min
Average arrival delay
4.0%
Cancelled
9 min early
Median arrival delay

Based on 423 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon81%(59 flights)
  • Tue86%(58 flights)
  • Wed84%(61 flights)
  • Thu86%(57 flights)
  • Fri72%(57 flights)
  • Sat86%(58 flights)
  • Sun84%(56 flights)
On-time by departure window
  • 3–6 AM93%(14 flights)
  • 6–9 AM85%(176 flights)
  • 12–3 PM—(2 flights)
  • 3–6 PM87%(89 flights)
  • 6–9 PM88%(49 flights)
  • 9 PM–12 AM70%(76 flights)
On-time trend by month
81%
May

Jun 80% → May 81% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202580%30
July 202587%31
August 202587%31
September 202583%29
October 202581%31
November 202588%49
December 202578%32
January 202687%52
February 202685%39
March 202661%23
April 202686%28
May 202681%31
Departures on time
85%
Diverted
0%
Flights flown
406
Months covered
12

Keep nerding

Based on 423 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.