Am I missing something?
It was about 11:00 PM and dark when their flight began. I believe it was someone on the plane looking at their watch or phone that indicated this. Flash forward to about the time the fighter jets begin flying alongside the plane and there is day light (indicating they have arrived in Iceland, I assume).
Liam Neeson received the first text message shortly after the plane took off, which then started the first 20 minute countdown. There was only one more 20 minute countdown almost immediately after that... and then the countdown of the bomb, which was what, thirty minutes? Then there were the jets and day light.
As the movie made it quite clear there wasn't much extra time between these events, there couldn't have been more than 2 hours that passed from take off to emergency landing.
So they flew out of a NYC airport and emergency landed in Iceland in two hours?