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Comment by lxgr | Hacker News Reader

I wonder if there is any mechanism that reconfirms landing slots (and other aspects of the flight plan) still being available after a delayed takeoff for cases like this.

Is it really just a matter of taking off and hoping for the best, or did somebody in the chain of granting a take-off clearance miss something?

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I've had flights that were delayed, and then during the start of the boarding process, we had to stop and switch to a different aircraft, because the delay meant we'd be too loud for the noise curfew when we arrived, so we needed to take a quieter plane. That was a domestic flight into a small airport (LGB), but I imagine there's something to manage total flight volume in general; there's certainly exception handling to delay or cancel departures when the destination airport is unlikely to be available due to weather.

That’s a static rule that the pilots can (and have to) comply with based on information available to them, though.

I wonder if an updated (international) flight plan is checked for projected congestion levels (based on other flight plans?) at all and can be declined for that reason?

The flightplans get shared and updated with every involved area. Usually those can say no ahead of time and always at the time of airspace entry (entering US airspace for example) What checks the FAA does to those plans, I doubt we'll ever know

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