I do not understand airport time. Like the flight leaves at 00:20
And returns at 14:50

What times is that in plain english?

I do not understand airport time. like the flight leaves at 00:20
and returns at 14:50

what times is that in plain english??
That would be military time.

00:20 is 12:20 am and 14:50 would be 2:50 pm.

Its called the 24 hour clock. Starting at l2 then l is l3, 2 is l4, etc. all the way around to l2 again which becomes 24. Therefore the 24 hour clock. Its used by the military et al.