Flight number record
AA 2539
American Airlines · Miami to Boston
- Route
- MIA → BOS
- Departs
- 19:50
- Flights
- 322
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AA 2539, check with American Airlines.
AA 2539 earns a D, which is as low as this site's scale goes for a reason. Only 57.8% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.3%. Late arrivals average about an hour. Treat any tight connection here as a coin flip. That rests on 322 flights, with a median arrival 6 minutes late.
The national on-time rate over the same period is 77.3%, so AA 2539 runs 20 points behind the country as a whole. Across a thousand flights that is about 195 extra late arrivals.
Key figures
On time
57.8%
Arrivals under 15 minutes late, of 315 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.86%
National rate is 1.89%
1 hour+ late
15.6%
National rate is 8.3%
These figures cover 322 flights between September 2025 and August 2026. Beyond the headline rate, 15.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When AA 2539 flies
AA 2539 flies MIA to BOS without a single fixed slot. Its most common scheduled departure was 19:50, used on 66 of 322 flights, with 19:40 (44 flights) and 20:13 (41 flights) next.
- Departs 19:5066 flights20.5%
- Departs 19:4044 flights13.7%
- Departs 20:1341 flights12.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 19:50 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and AA 2539 runs 10 points worse at 57.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
AA 2539 next to MIA to BOS
Every carrier on MIA to BOS combined arrived on time 69.8% of the time across 3,366 flights, so AA 2539 is 12 points behind it. American flew 2,271 flights on the same city pair under all its flight numbers, including this one, and those ran 71.1% on time. Across its whole network American Airlines managed 74.7%, which this flight trails by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 2539thin sample | 322 | 57.8% | 65 min | 1.86% | D |
| All American Airlines on MIA–BOS | 2,271 | 71.1% | 70 min | 1.67% | C |
| All carriers on MIA–BOS | 3,366 | 69.8% | 72 min | 2.20% | C |
| American Airlines, whole network | 988,892 | 74.7% | 85 min | 2.14% | C |
Across the year
AA 2539 quarter by quarter
AA 2539 did not run the same all year. Its best quarter was Oct–Dec 2025 at 73.3% on time and its weakest Jul–Sep 2026 at 44.1%, a swing of 29 points on roughly 81 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202526 flights—
- Oct–Dec 202561 flights73.3%
- Jan–Mar 202685 flights54.4%
- Apr–Jun 202691 flights61.5%
- Jul–Sep 202659 flights44.1%
Scale runs 35% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, AA 2539 did best on Saturday at 65.1% on time and worst on Monday at 48.9%. Each day rests on about 46 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AA 2539 runs when it is late
The 133 late arrivals split 31 under half an hour, 53 between 30 and 60 minutes, and 49 an hour or more.
- 15+ min early50 flights15.9%
- Within 15 min132 flights41.9%
- 15–29 min late31 flights9.8%
- 30–59 min late53 flights16.8%
- 1–2 hours late38 flights12.1%
- 2+ hours late11 flights3.5%
Scale runs 0% to 100%.
Share of 315 completed flights by arrival against schedule.
19 of 136 late departures made up the time and arrived on time, 14% of them. In the other direction, 16 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BOS.
The worst days
Worst days for AA 2539
The latest arrival of the period was on 30 January 2026, 13 hours 52 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 January 2026 | 13 hours 52 minutes | Carrier |
| 14 January 2026 | 4 hours 32 minutes | Carrier |
| 22 October 2025 | 4 hours 19 minutes | Carrier |
| 1 February 2026 | 3 hours 37 minutes | Late-arriving aircraft |
| 18 July 2026 | 3 hours 9 minutes | National Airspace System |
Delay causes
Why AA 2539 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 8,641 reported delay minutes.
- 41%Late-arriving aircraft
- 35%Carrier
- 18%National Airspace System
- 5%Extreme weather
41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,641 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 8,641 delay minutes reported on AA 2539.
Cancellations sit at 1.86% against a national 1.89%, which is ordinary. Diversions add another 0.31%.
Connections and routes
What a delay on this flight costs
15.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,258 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on two other city pairs in the data, including CMH to LAX (30) and LAX to CMH (30), but none flew often enough under AA 2539 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MIA to BOS only.
One caution: this is a thin sample. 322 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AA 2539
For a booking, AA 2539 is a flight to put a long connection behind. 15.6% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- MIA to BOS, every carrier and departure
- BOS to MIA, the return direction
- American Airlines 1074 on the same route61.5%
- American Airlines 1054 on the same route58.0%
- Miami International (MIA) delay statistics
- Boston Logan International (BOS) delay statistics
- American Airlines on-time record
- Every American Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means American Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.