Flight profile · JetBlue
B6399
New York (LGA) to Orlando (MCO) · scheduled 2:55 PM – 6:05 PM
How B6399 performs
676 operations, July 2023 – July 2026.
B6399 arrived on time 63.1% of the time, against 73.0% for all LGA → MCO flights, so this departure is 9.9 percentage points worse than the route as a whole. Against JetBlue’s own flights on this route it is 7.0 points worse.
Source: US DOT Bureau of Transportation Statistics · 676 operations, July 2023 – July 2026 · If B6399 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 B6399 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 96% of 11,788 comparable flight numbers.
A typical arrival is 2 min late, but the worst tenth run 111 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 B6399 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 |
|---|---|---|---|---|---|
| B6399 | 63.1% | 2.51% | 2 min | 19.4% | 676 |
| JetBlue on LGA → MCO | 70.1% | 2.59% | -5 min | 14.4% | 4,486 |
| All LGA → MCO flights | 73.0% | 2.85% | -7 min | 12.2% | 15,987 |
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
Why B6399 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for B6399 on LGA → MCO. 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 B6399 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, B6399 pushed back an average of 92 minutes late; when it came in on time or early, an average of 9 minutes late.
Each departure is matched to the flight the same aircraft flew into LGA just before it, using the tail number in the DOT file, 609 of 660 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 | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| B6399 | 20% | 96% | 19% |
| Network, same turn | 18% | 85% | 10% |
The schedule leaves a normal turn: enough time to clean and board if the aircraft is on time, little to spare if it is not.
The network row is every flight with a scheduled turn of 45 to 59 minutes. How often B6399’s aircraft landed 15 or more minutes late is about the same as the network’s and, once the aircraft was late, how often B6399 left 15 or more minutes late is higher than the network’s.
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 LGA late, does that still matter by the time it reaches MCO?
B6399 pushes back an average of 30.2 minutes late and reaches the gate at MCO an average of 25.7 minutes late. The 4.6 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 27.0 minutes on the taxiways at LGA, 1.4 minutes longer than a typical LGA departure in the same hour.
On arrival at MCO, B6399 spends 13.4 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 2.5 minutes longer than a typical MCO arrival (10.9 min).
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 MCO. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 29,464 departures from LGA scheduled in the clock hour B6399 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at MCO (498,229 flights), not just B6399’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026
The hour it leaves LGA
Part of any flight’s record belongs to the clock rather than to the flight. B6399 has one departure time, so this is what that time is worth.
On-time arrival rate. 29,464 departures from LGA are scheduled in the 2 PM–3 PM hour over the period, against 456,467 across the whole day.
B6399 is scheduled out of LGA at 2:55 PM, in the 2 PM–3 PM bank. Departures from LGA in that hour arrive on time 75.2% of the time against 78.3% across the airport’s whole day — the slot alone is worth 3.1 points worse before anything about this particular flight is considered.
The two airport figures cover every departure from LGA 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.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
113 min late
against a median of 2 min late
B6399 has an average that understates its risk: a typical arrival is 2 min late, but the worst tenth are 111 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 676 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| NK1350 | Spirit Airlines | 95.1% | 22 min early | 609 |
| B6299 | JetBlue | 86.6% | 10 min early | 845 |
| B6599 | JetBlue | 84.6% | 10 min early | 713 |
| DL2561 | Delta Air Lines | 65.3% | 2 min early | 782 |
| B6399 this flight | JetBlue | 63.1% | 2 min late | 676 |
| B6499 | JetBlue | 61.4% | 2 min late | 966 |
| DL2520 | Delta Air Lines | 58.9% | 5 min late | 782 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. B6399 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 676 records of B6399 operating LGA → MCO, 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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