Flight number record
AA 1074
American Airlines · Miami to Boston
- Route
- MIA → BOS
- Departs
- 17:35
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AA 1074, check with American Airlines.
AA 1074 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 364 flights, with a median arrival 5 minutes late.
The national on-time rate over the same period is 77.6%, so AA 1074 runs 19 points behind the country as a whole. Across a thousand flights that is about 188 extra late arrivals.
Key figures
On time
58.8%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.81%
1 hour+ late
16.5%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 16.5% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When AA 1074 flies
AA 1074 flies MIA to BOS without a single fixed slot. Its most common scheduled departure was 17:35, used on 46 of 364 flights, with 17:40 (42 flights) and 18:50 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:3546 flights12.6%
- Departs 17:4042 flights11.5%
- Departs 18:5041 flights11.3%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:35 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AA 1074 runs 9 points worse at 58.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
AA 1074 next to MIA to BOS
Every carrier on MIA to BOS combined arrived on time 69.7% of the time across 3,415 flights, so AA 1074 is 11 points behind it. American flew 2,230 flights on the same city pair under all its flight numbers, including this one, and those ran 70.7% on time. Across its whole network American Airlines managed 74.4%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 1074thin sample | 364 | 58.8% | 70 min | 1.92% | D |
| All American Airlines on MIA–BOS | 2,230 | 70.7% | 71 min | 1.75% | C |
| All carriers on MIA–BOS | 3,415 | 69.7% | 73 min | 2.40% | C |
| American Airlines, whole network | 986,297 | 74.4% | 85 min | 2.29% | C |
Across the year
AA 1074 quarter by quarter
AA 1074 did not run the same all year. Its best quarter was Jan–Mar 2026 at 67.1% on time and its weakest Jul–Sep 2025 at 42.9%, a swing of 24 points on roughly 91 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 202592 flights42.9%
- Oct–Dec 202591 flights63.3%
- Jan–Mar 202690 flights67.1%
- Apr–Jun 202691 flights62.6%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, AA 1074 did best on Saturday at 76.5% on time and worst on Sunday at 40.0%. Each day rests on about 52 flights, so a gap of 37 points is worth noticing but could still narrow in another year.
Delay causes
Why AA 1074 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 10,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 45%Late-arriving aircraft
- 31%National Airspace System
- 17%Carrier
- 7%Extreme weather
- 0%Security
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 10,000 reported delay minutes here, that single category outweighs weather by 7 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 10,237 delay minutes reported on AA 1074.
Cancellations sit at 1.92% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 16.5% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 364 flights under AA 1074 in the data flew MIA to BOS. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 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 1074
For a booking, AA 1074 is a flight to put a long connection behind. 16.5% 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 1054 on the same route61.4%
- American Airlines 2539 on the same route60.3%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.