Flight profile · American Airlines
AA1921
Miami (MIA) to Tampa (TPA) · scheduled 8:53 PM – 10:00 PM
How AA1921 performs
720 operations, July 2023 – July 2026.
AA1921 arrived on time 60.6% of the time, against 70.2% for all MIA → TPA flights, so this departure is 9.6 percentage points worse than the route as a whole. Against American Airlines’ own flights on this route it is 7.3 points worse.
Source: US DOT Bureau of Transportation Statistics · 720 operations, July 2023 – July 2026 · If AA1921 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How AA1921 compares to other flight numbers, not just to itself.
This flight's worst arrivals run unusually far past its typical one, a bigger gap than 94% of 11,788 comparable flight numbers.
A typical arrival is 4 min late, but the worst tenth run 102 minutes worse than that.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where AA1921 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| AA1921 | 60.6% | 1.53% | 4 min | 20.6% | 720 |
| American Airlines on MIA → TPA | 67.9% | 1.56% | -1 min | 13.9% | 6,968 |
| All MIA → TPA flights | 70.2% | 1.67% | -2 min | 12.5% | 8,434 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why AA1921 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for AA1921 on MIA → TPA. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies AA1921 comes in late, and what that does to the departure.
The aircraft flying AA1921 came in 15 or more minutes late on 30% of the departures where its previous flight is known. There are not enough departures in both groups to say how the flight left after a late one and after an on-time one.
Each departure is matched to the flight the same aircraft flew into MIA just before it, using the tail number in the DOT file, 365 of 709 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| AA1921 | 30% |
| Network, same turn | 33% |
The schedule leaves a long gap on the ground, which gives a late aircraft room to catch up before this flight pushes back.
The network row is every flight with a scheduled turn of 3 to 6 hours. How often AA1921’s aircraft landed 15 or more minutes late is lower than the network’s. There are not enough departures in both groups to compare how it left.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
From pushback to gate
When it leaves MIA late, does that still matter by the time it reaches TPA?
AA1921 pushes back an average of 39.4 minutes late and reaches the gate at TPA an average of 34.6 minutes late. The 4.8 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 22.0 minutes on the taxiways at MIA, 1.9 minutes shorter than a typical MIA departure in the same hour.
On arrival at TPA, AA1921 spends 5.8 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at TPA spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached TPA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 20,262 departures from MIA scheduled in the clock hour AA1921 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at TPA (242,635 flights), not just AA1921’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves MIA
Part of any flight’s record belongs to the clock rather than to the flight. AA1921 has one departure time, so this is what that time is worth.
On-time arrival rate. 20,262 departures from MIA are scheduled in the 8 PM–9 PM hour over the period, against 340,469 across the whole day.
AA1921 is scheduled out of MIA at 8:53 PM, in the 8 PM–9 PM bank. Departures from MIA in that hour arrive on time 64.9% of the time against 73.2% across the airport’s whole day — the slot alone is worth 8.3 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from MIA to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Hours below 120 departures are not scored.
Other routes AA1921 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DCA→JAX Washington to Jacksonville | November 5, 2023 – May 20, 2026 | 389 | 79.7% |
Because the same number has served different journeys, the statistics above describe only the route AA1921 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
106 min late
against a median of 4 min late
AA1921 has an average that understates its risk: a typical arrival is 4 min late, but the worst tenth are 102 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 720 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Data and methodology
Calculated by FlyerIntel from 720 records of AA1921 operating MIA → TPA, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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