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Flight Reliability

AA 4399 · American Airlines

This number covered several routes in this period.

One number, several routes.

Airlines reuse flight numbers, and AA 4399 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

76%
Arrive within 15 minutes
10 min
Average arrival delay
3.4%
Cancelled
3 min early
Median arrival delay

Based on 353 historical flights. Data through May 2026.

The breakdown

On-time by weekday
  • Mon77%(52 flights)
  • Tue78%(49 flights)
  • Wed80%(46 flights)
  • Thu71%(55 flights)
  • Fri68%(50 flights)
  • Sat81%(37 flights)
  • Sun80%(51 flights)
On-time by departure window
  • 6–9 AM89%(93 flights)
  • 9 AM–12 PM88%(32 flights)
  • 12–3 PM84%(121 flights)
  • 3–6 PM50%(94 flights)
On-time trend by month
89%
May

Jun 60% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202560%30
July 202543%28
September 202582%11
October 202542%24
November 202583%24
December 202569%26
January 202683%29
February 202691%42
March 202684%50
April 202697%33
May 202689%37
Departures on time
83%
Diverted
0.3%
Flights flown
340
Months covered
12

Keep nerding

Based on 353 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.