AA4539 ChicagoORD · 21:23 PittsburghPIT · 00:07
AA4539 by American Airlines flies from Chicago (ORD) to Pittsburgh (PIT).
scheduled from ORD
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at ORD and PIT are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Chicago to Pittsburgh flights today
same route · American AirlinesIf AA4539 is cancelled, these are the other American Airlines nonstop flights from Chicago to Pittsburgh on the same day, with scheduled departure times in ORD local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How AA4539 actually runs
Pro Flight Search has tracked every published board update for AA4539 across the ORD and PIT boards: schedule changes, gate pushes and actual clocks. Early read — pattern not clear yet. Only 1 completed leg so far: left right on schedule but landed about 18 min early. Not enough to call it.
The verdict above is that record speaking, so it reflects how AA4539 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: N122HQ.
Board clocks recorded as ORD and PIT published them.
Planning around AA4539? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
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Pro Flight Search — AA4539 Chicago to Pittsburgh on-time performance, measured from the ORD and PIT airport boards.
https://proflightsearch.com/flight/AA4539
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