Flight profile · Republic Airways
YX5721
Boston (BOS) to New York (LGA) · scheduled 5:00 PM – 6:33 PM
How YX5721 performs
728 operations, June 2024 – July 2026.
YX5721 arrived on time 72.6% of the time, against 81.1% for all BOS → LGA flights, so this departure is 8.5 percentage points worse than the route as a whole. Against Republic Airways’ own flights on this route it is 8.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 728 operations, June 2024 – July 2026 · If YX5721 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where YX5721 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
Ask for the position of YX5721 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| YX5721 | 72.6% | 6.73% | -10 min | 11.8% | 728 |
| Republic Airways on BOS → LGA | 80.7% | 4.58% | -10 min | 8.6% | 16,020 |
| All BOS → LGA flights | 81.1% | 4.01% | -11 min | 8.5% | 22,955 |
YX5721 has cancelled 6.73% of its scheduled departures (49 of 728), against 4.01% for all BOS → LGA flights — this specific departure cancels 2.7 percentage points more 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 YX5721 specifically, not about the route it flies.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
Why YX5721 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for YX5721 on BOS → LGA. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies YX5721 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, YX5721 pushed back an average of 49 minutes late; when it came in on time or early, an average of 5 minutes 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, 669 of 681 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 |
|---|---|---|---|
| YX5721 | 24% | 71% | 13% |
| 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 YX5721’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often YX5721 left 15 or more minutes late is lower 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 June 2024 – July 2026
From pushback to gate
When it leaves BOS late, does that still matter by the time it reaches LGA?
YX5721 pushes back an average of 18.8 minutes late and reaches the gate at LGA an average of 11.2 minutes late. The 7.6 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 27.5 minutes on the taxiways at BOS, 3.1 minutes longer than a typical BOS departure in the same hour.
On arrival at LGA, YX5721 spends 9.4 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 1.3 minutes longer than a typical LGA arrival (8.2 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 LGA. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 30,895 departures from BOS scheduled in the clock hour YX5721 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at LGA (456,481 flights), not just YX5721’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · June 2024 – July 2026
The hour it leaves BOS
Part of any flight’s record belongs to the clock rather than to the flight. YX5721 has one departure time, so this is what that time is worth.
On-time arrival rate. 30,895 departures from BOS are scheduled in the 5 PM–6 PM hour over the period, against 440,893 across the whole day.
YX5721 is scheduled out of BOS at 5:00 PM, in the 5 PM–6 PM bank. Departures from BOS in that hour arrive on time 66.7% of the time against 77.2% across the airport’s whole day — the slot alone is worth 10.5 points worse 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 · June 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes YX5721 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 |
|---|---|---|---|
| IND→BOS Indianapolis to Boston | February 14, 2026 – March 7, 2026 | 5 | — |
| LGA→GSO New York to Greensboro | May 10, 2025 – June 7, 2025 | 5 | — |
| CLT→DTW Charlotte to Detroit | December 24, 2024 – January 1, 2025 | 4 | — |
| LGA→BUF New York to Buffalo | May 7–21, 2024 | 13 | — |
| LGA→SYR New York to Syracuse | April 13, 2024 – May 4, 2024 | 4 | — |
| BOS→EWR Boston to Newark | March 11, 2024 – April 8, 2024 | 21 | — |
| EWR→BOS Newark to Boston | March 11, 2024 – April 8, 2024 | 21 | — |
| BOS→DCA Boston to Washington | January 8, 2024 – March 8, 2024 | 52 | — |
| LGA→BNA New York to Nashville | December 23, 2023 – January 5, 2024 | 10 | — |
| BOS→ORD Boston to Chicago | December 24, 2023 – January 1, 2024 | 4 | — |
| ORD→BOS Chicago to Boston | December 24, 2023 – January 1, 2024 | 4 | — |
| BOS→CLE Boston to Cleveland | December 7–15, 2023 | 9 | — |
| CLE→BOS Cleveland to Boston | December 7–15, 2023 | 8 | — |
| DCA→BOS Washington to Boston | December 5, 2023 | 1 | — |
| BOS→PHL Boston to Philadelphia | November 1–3, 2023 | 3 | — |
| BGR→LGA Bangor to New York | October 30–31, 2023 | 2 | — |
| BOS→JFK Boston to New York | September 16, 2023 – October 4, 2023 | 19 | — |
| LGA→BOS New York to Boston | July 2, 2023 – September 4, 2023 | 53 | — |
Because the same number has served different journeys, the statistics above describe only the route YX5721 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.
70 min late
against a median of 10 min early
YX5721 has an average that understates its risk: a typical arrival is 10 min early, but the worst tenth are 80 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 728 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering June 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| YX5744 | Republic Airways | 87.1% | 8 min early | 610 |
| YX5735 | Republic Airways | 86.1% | 10 min early | 644 |
| YX5748 | Republic Airways | 84.1% | 10 min early | 646 |
| YX5730 | Republic Airways | 79.2% | 10 min early | 638 |
| YX5721 this flight | Republic Airways | 72.6% | 10 min early | 728 |
| YX5716 | Republic Airways | 68.4% | 6 min early | 649 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. YX5721 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 728 records of YX5721 operating BOS → LGA, 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