Flight profile · Republic Airways
YX4378
New York (JFK) to Raleigh–Durham (RDU) · scheduled 10:30 AM – 12:16 PM
How YX4378 performs
725 operations, April 2024 – August 2026.
Between its first and last recorded date on JFK → RDU, YX4378 averaged about 6 operations a week (725 in 880 days, cancelled ones included).
YX4378 arrived on time 87.3% of the time, against 77.8% for all JFK → RDU flights, so this departure is 9.5 percentage points better than the route as a whole. Against Republic Airways’ own flights on this route it is 5.8 points better.
Source: US DOT Bureau of Transportation Statistics · 725 operations, April 2024 – August 2026 · If YX4378 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where YX4378 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| YX4378 | 87.3% | 1.93% | -9 min | 4.2% | 725 |
| Republic Airways on JFK → RDU | 81.5% | 4.88% | -9 min | 7.1% | 4,423 |
| All JFK → RDU flights | 77.8% | 4.20% | -8 min | 9.2% | 10,053 |
YX4378 has cancelled 1.93% of its scheduled departures (14 of 725), against 4.20% for all JFK → RDU flights — this specific departure cancels 2.3 percentage points less often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about YX4378 specifically, not about the route it flies.
4.2% of YX4378’s arrivals were an hour or more late, against 9.2% across JFK → RDU, so the long delays are less common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · April 2024 – August 2026
Why YX4378 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s 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 YX4378 on JFK → RDU. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering April 2024 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies YX4378 comes in late, and what that does to the departure.
The aircraft flying YX4378 came in 15 or more minutes late on 9% 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.
Matched by tail number to the aircraft’s previous flight into JFK: 433 of 711 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late |
|---|---|
| YX4378 | 9% |
| Network, same turn | 17% |
60 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 60 to 89 minutes. How often YX4378’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.
Source: US DOT Bureau of Transportation Statistics · Data covering April 2024 – August 2026
From pushback to gate
When it leaves JFK late, does that still matter by the time it reaches RDU?
YX4378 pushes back an average of 0.1 minutes early and reaches the gate at RDU an average of 2.5 minutes early. The 2.4 minutes between those two figures are slack the published schedule already carries. Its 23.9 minutes on the taxiways at JFK is about what any departure from the airport in that hour spends.
On arrival at RDU, YX4378 spends 9.2 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 2.2 minutes longer than a typical RDU arrival (7.0 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 12,290 JFK departures. Taxi-in is landing to gate, set against 184,579 arrivals at RDU. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · April 2024 – August 2026
The hour it leaves JFK
YX4378 has one departure time, 10:30 AM, so this is what that hour at JFK is worth.
On-time arrival rate. 12,290 departures from JFK are scheduled in the 10 AM–11 AM hour over the period, against 360,775 across the whole day.
YX4378 is scheduled out of JFK at 10:30 AM, in the 10 AM–11 AM bank. Departures from JFK in that hour arrive on time 80.2% of the time against 76.7% across the airport’s whole day — the slot alone is worth 3.5 points better before anything about this particular flight is considered.
Both airport figures cover every destination from JFK, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · April 2024 – August 2026 · Hours below 120 departures are not scored.
Other routes YX4378 has flown
Carriers reassign flight numbers. YX4378 also served these 12 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| LGA→BUF New York to Buffalo | May 21, 2026 – August 4, 2026 | 76 | — |
| BUF→LGA Buffalo to New York | May 21, 2026 – August 4, 2026 | 65 | — |
| BOS→LGA Boston to New York | April 7, 2026 – May 20, 2026 | 44 | — |
| LGA→BOS New York to Boston | April 7, 2026 – May 20, 2026 | 44 | — |
| ATL→DCA Atlanta to Washington | January 8, 2024 – April 6, 2026 | 103 | 80.4% |
| DCA→ATL Washington to Atlanta | January 8, 2024 – April 6, 2026 | 103 | 90.2% |
| RDU→JFK Raleigh–Durham to New York | April 4, 2024 – November 4, 2024 | 185 | 84.6% |
| ORD→IND Chicago to Indianapolis | December 5, 2023 – January 7, 2024 | 34 | — |
| CLT→PIT Charlotte to Pittsburgh | November 27, 2023 | 1 | — |
| STL→BOS St. Louis to Boston | November 20, 2023 | 1 | — |
| DCA→CHS Washington to Charleston | July 5, 2023 – November 3, 2023 | 99 | 81.4% |
| DCA→BTV Washington to Burlington | July 2, 2023 – August 13, 2023 | 7 | — |
The figures above describe only JFK → RDU, the route YX4378 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
22 min late
against a median of 9 min early
Percentiles over 725 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering April 2024 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| YX4378 this flight | Republic Airways | 87.3% | 9 min early | 725 |
| B62285 | JetBlue | 80.0% | 7 min early | 793 |
| YX4658 | Republic Airways | 77.5% | 5 min early | 754 |
| YX4573 | Republic Airways | 72.7% | 5 min early | 664 |
| B61185 | JetBlue | 58.1% | 3 min late | 624 |
Among all 5 departures on this route with at least 600 operations, YX4378 has the highest on-time rate. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 725 records of YX4378 operating JFK → RDU, 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 reported separately, not in the on-time rate.
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