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Flight Reliability

AA 4509 · American Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and AA 4509 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

81%
Arrive within 15 minutes
2 min
Average arrival delay
3.2%
Cancelled
13 min early
Median arrival delay

Based on 378 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon72%(53 flights)
  • Tue79%(53 flights)
  • Wed87%(52 flights)
  • Thu81%(53 flights)
  • Fri85%(59 flights)
  • Sat97%(36 flights)
  • Sun75%(60 flights)
On-time by departure window
  • 3–6 AM—(3 flights)
  • 6–9 AM100%(27 flights)
  • 9 AM–12 PM92%(144 flights)
  • 12–3 PM78%(104 flights)
  • 3–6 PM57%(76 flights)
  • 9 PM–12 AM92%(12 flights)
On-time trend by month
85%
May

Jul 43% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
July 202543%40
August 2025100%33
September 202593%57
October 2025100%10
November 202568%22
December 202577%30
January 202673%30
February 202678%18
March 202681%47
April 2026100%35
May 202685%39
Departures on time
82%
Diverted
0%
Flights flown
366
Months covered
12

Keep nerding

Based on 378 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.