Flight profile · JetBlue
B6721
Boston (BOS) to West Palm Beach (PBI) · scheduled 8:45 PM – 11:59 PM
How B6721 performs
481 operations, 2024-02-15 to 2026-04-28.
B6721 arrived on time 58.2% of the time, against 68.2% for all BOS → PBI flights — this specific departure is 10.0 percentage points worse than the route as a whole. Against JetBlue’s own flights on this route it is 7.6 points worse.
Source: US DOT Bureau of Transportation Statistics · 481 operations between 2024-02-15 to 2026-04-28
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| B6721 | 58.2% | 2.08% | 6 min | 18.6% | 481 |
| JetBlue on BOS → PBI | 65.8% | 1.90% | 1 min | 14.5% | 4,516 |
| All BOS → PBI flights | 68.2% | 1.78% | -1 min | 13.2% | 6,225 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-02-15 to 2026-04-28
Other routes B6721 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 |
|---|---|---|---|
| BOS→SAV Boston to Savannah | 2023-12-23 – 2024-01-01 | 10 | — |
Because the same number has served different journeys, the statistics above describe only the route B6721 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.
107 min late
against a median of 6 min late
B6721 is a flight whose average understates its risk: a typical day arrives 6 min late, but the worst tenth of days are 101 minutes worse than that. If the day has something unmissable in it, the median is the wrong number to plan against.
Percentiles over 481 operations. Cancelled and diverted flights have no arrival time and are counted separately rather than as very late arrivals.
Why B6721 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for B6721 on BOS → PBI. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on BOS → PBI
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| DL1245 | Delta Air Lines | 82.7% | 11 min early | 720 |
| B6321 | JetBlue | 66.9% | 1 min late | 678 |
| DL2160 | Delta Air Lines | 63.4% | 2 min late | 720 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 481 records of B6721 operating BOS → PBI, 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.
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