Flight number record
AA 1843
American Airlines · Charlotte to Boston
- Route
- CLT → BOS
- Departs
- 22:29
- Flights
- 353
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AA 1843, check with American Airlines.
AA 1843 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 353 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so AA 1843 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.
Key figures
On time
70.8%
Arrivals under 15 minutes late, of 342 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
2.83%
National rate is 1.89%
1 hour+ late
9.4%
National rate is 8.3%
These figures cover 353 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When AA 1843 flies
AA 1843 flies CLT to BOS without a single fixed slot. Its most common scheduled departure was 22:29, used on 42 of 353 flights, with 20:13 (36 flights) next.
- Departs 22:2942 flights11.9%
- Departs 20:1336 flights10.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 22:29 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and AA 1843 runs level with that at 70.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AA 1843 next to CLT to BOS
Every carrier on CLT to BOS combined arrived on time 76.0% of the time across 4,006 flights, so AA 1843 is 5 points behind it. American flew 2,726 flights on the same city pair under all its flight numbers, including this one, and those ran 74.1% on time. Across its whole network American Airlines managed 74.7%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 1843thin sample | 353 | 70.8% | 57 min | 2.83% | C |
| All American Airlines on CLT–BOS | 2,726 | 74.1% | 66 min | 2.13% | C |
| All carriers on CLT–BOS | 4,006 | 76.0% | 69 min | 2.47% | B |
| American Airlines, whole network | 988,892 | 74.7% | 85 min | 2.14% | C |
Across the year
AA 1843 quarter by quarter
AA 1843 did not run the same all year. Its best quarter was Jan–Mar 2026 at 81.0% on time and its weakest Jul–Sep 2026 at 42.4%, a swing of 39 points on roughly 71 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights73.3%
- Oct–Dec 202588 flights73.3%
- Jan–Mar 202686 flights81.0%
- Apr–Jun 202689 flights77.3%
- Jul–Sep 202660 flights42.4%
Scale runs 35% to 85%.
By weekday, AA 1843 did best on Saturday at 80.4% on time and worst on Sunday at 55.1%. Each day rests on about 50 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AA 1843 runs when it is late
The 100 late arrivals split 32 under half an hour, 36 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early56 flights16.4%
- Within 15 min186 flights54.4%
- 15–29 min late32 flights9.4%
- 30–59 min late36 flights10.5%
- 1–2 hours late21 flights6.1%
- 2+ hours late11 flights3.2%
Scale runs 0% to 100%.
Share of 342 completed flights by arrival against schedule.
29 of 121 late departures made up the time and arrived on time, 24% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for AA 1843
The latest arrival of the period was on 1 February 2026, 4 hours 2 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 February 2026 | 4 hours 2 minutes | Late-arriving aircraft |
| 22 June 2026 | 3 hours 29 minutes | Late-arriving aircraft |
| 28 July 2026 | 3 hours 25 minutes | Late-arriving aircraft |
| 14 October 2025 | 3 hours 9 minutes | Late-arriving aircraft |
| 3 August 2026 | 2 hours 46 minutes | Late-arriving aircraft |
Delay causes
Why AA 1843 runs late
Late-arriving aircraft accounts for 55% of the 5,719 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Late-arriving aircraft
- 22%Carrier
- 15%National Airspace System
- 7%Extreme weather
- 1%Security
55% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,719 reported delay minutes here, that single category outweighs weather by 8 to one. The split is drawn from 5,719 delay minutes reported on AA 1843.
Cancellations run at 2.83%, against 1.89% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 728 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on one other city pair in the data, including CLT to PDX (1), but none flew often enough under AA 1843 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to CLT to BOS only.
One caution: this is a thin sample. 353 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking AA 1843
For a booking, the cancellation rate is the figure to plan around on AA 1843: 2.83% of its 353 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- CLT to BOS, every carrier and departure
- BOS to CLT, the return direction
- Republic Airways 5648 on the same route91.1%
- Republic Airways 5630 on the same route71.8%
- Charlotte Douglas International (CLT) delay statistics
- Boston Logan International (BOS) delay statistics
- American Airlines on-time record
- Every American Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means American Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.