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I also made some research to know the average time between two take offs and landings, the average actual time gap is about 35 seconds between two aircrafts. Let's take some gap and consider 45 seconds between two planes.
You will understand that we can't just take your word on this. Given the fact that Newark mostly serves non-small planes and that standard separation is 2 minutes for one runway, intersecting runways and runways closer than 2500ft to one another, your values would imply that they had 3 or 4 parallel runways >2500 from one another. This isn't the case. Newark has two major runways separated by about 800 ft only, and a smaller runway that intersects both the others. Therefore, I'd be surprised to see much more than 30 takeoffs or landings per hour.
Between 8:00 and 8:30 it was possible to land and take off 40 aircrafts. Within that time there was 29 aircrafts, and UA93 was one of the first ones.
See below: assuming an average separation of 92 rather than 45 seconds, , it was possible to land and takeoff 20 planes
That means there was no reason to push UA93 after the 15 planes which took off between 8:10 and 8:42. And that means UA93 was delayed to make possible its control by the team who was controlling the planes.
The intervall 8:00 - 8:30 had 29 planes - 9 more than the airport coukd handle. That would have resulted in a delay of 14 minutes.
The half hour before that, 7:30-8:00, had 19 planes - about full capacity.
Between 7:00 and 7:30 there were 25 planes - 5 above capacity, or a delay of 8 minutes, that could not be made up during the following half hour.
mehmetin, your data, assuming it is correct to start with, suggests that UA93 had reason for a delay of at least 20 minutes, just counting planes. In reality, there could be factors we don't know about:
- were they already behind schedule at 7:00?
- Were there more large jets durung that time frame than earlier or later that morning?
I manually count 156 takeoffs/landings during 4 hours , or about 40 per hour. Average separation would be 1 minute 32 seconds, not 35 seconds as you said.
What do the time values reefer to - actual takeoff/touch down? Or scheduled? Because 14 takeoffs in the 5 minutes between 7:00 and 7:05, that's one plane every 21 seconds, is of course unreal.