I didnt know they prescribed pain killers for flights?? I thought valium or xanax or something among those sorts. If youve never taken percodan before..its in the opiate family. Make sure you have eaten something filling before..like breads,etc...The first time I ever took vicodin was when I was 17 for wisdom teeth being pulled..Two of those knocked me out..Nowadays they dont do much for me..but since your new dont take too many and drink plenty of fluids..Keep crackers or bread with you too. Good Luck.
PS: Dont get addicted! Withdrawl is a killer...opiates are very easy to get hooked on.