I think, in general, if your mind is occupied with something you find fun or interesting, the time will pass quickly. During plane rides, since I am a big scaredy cat, I will read a book or play a computer game. This can make a large amount of time go by quickly.

On the other hand, if you want time to slow down, just don't so anything. Just sit there. Longest day of your life. If you are thinking about stuff, time will pass more quickly. If you are just being aware, time will seem to pass more slowly.