Flight profile · JetBlue
B6109
Boston (BOS) to Jacksonville (JAX) · scheduled 7:00 AM – 9:07 AM
How B6109 performs
978 operations, September 2023 – July 2026.
B6109 arrived on time 83.5% of the time, against 75.7% for all BOS → JAX flights, so this departure is 7.8 percentage points better than the route as a whole. Against JetBlue’s own flights on this route it is 7.8 points better.
Source: US DOT Bureau of Transportation Statistics · 978 operations, September 2023 – July 2026 · If B6109 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where B6109 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| B6109 | 83.5% | 2.04% | -10 min | 7.3% | 978 |
| JetBlue on BOS → JAX | 75.7% | 2.07% | -6 min | 10.9% | 1,838 |
| All BOS → JAX flights | 75.7% | 1.89% | -7 min | 10.1% | 4,380 |
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026
Why B6109 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
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 B6109 on BOS → JAX. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies B6109 comes in late, and what that does to the departure.
B6109 is usually the aircraft’s first flight of the day: the schedule gives it a median of 7 hours on the ground at BOS, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, B6109 pushed back an average of 9 minutes late; when it came in on time or early, an average of 1 minute late.
Each departure is matched to the flight the same aircraft flew into BOS just before it, using the tail number in the DOT file, 768 of 958 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 |
|---|---|---|---|
| B6109 | 29% | 22% | 9% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often B6109’s aircraft landed 15 or more minutes late is about the same as the network’s and, once the aircraft was late, how often B6109 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 September 2023 – July 2026
From pushback to gate
When it leaves BOS late, does that still matter by the time it reaches JAX?
B6109 pushes back an average of 7.0 minutes late and reaches the gate at JAX an average of 1.3 minutes late. The 5.7 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 20.2 minutes on the taxiways at BOS, 2.1 minutes shorter than a typical BOS departure in the same hour.
On arrival at JAX, B6109 spends 6.1 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 JAX 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 JAX. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 43,804 departures from BOS scheduled in the clock hour B6109 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at JAX (90,311 flights), not just B6109’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026
The hour it leaves BOS
Part of any flight’s record belongs to the clock rather than to the flight. B6109 has one departure time, so this is what that time is worth.
On-time arrival rate. 43,804 departures from BOS are scheduled in the 7 AM–8 AM hour over the period, against 440,893 across the whole day.
B6109 is scheduled out of BOS at 7:00 AM, in the 7 AM–8 AM bank. Departures from BOS in that hour arrive on time 85.5% of the time against 77.2% across the airport’s whole day — the slot alone is worth 8.3 points better before anything about this particular flight is considered.
The two airport figures cover every departure from BOS 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 · September 2023 – July 2026 · Hours below 120 departures are not scored.
By day of week
Does B6109 run worse on particular days?
Tuesday is historically the most reliable day and Friday the least, a gap of 8.2 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · September 2023 – July 2026 · Days with fewer than 120 operations are not scored.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
34 min late
against a median of 10 min early
Percentiles over 978 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering September 2023 – July 2026
Data and methodology
Calculated by FlyerIntel from 978 records of B6109 operating BOS → JAX, 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
Analysis last recomputed