You follow the time table of your position while flying. It is the sun that tells you the prayer times and not the watch on the ground.

I am planning to go to Srilanka, leaving from Maryland 2nd june 6.30 pm. transit is Abu Dhabi. Then take another flight to Srilanka. then I reach there 4th June 3.30am. Which time table I have to follow for prayers. because I always get confused. do I have to follow,USA/Abu Dhabi/ Sri Lanka prayer time table