What information do i need to bring going with my aunt overseas on a airplane?

I am going on a plane overseas without my mom, i am going with my uncles wife. what information do i need to take to the airport letting me get on?What information do i need to bring going with my aunt overseas on a airplane?You will need a passport, and if you are under 18, you will need a letter of parental permission. see site below for info and on page 4 you can print out a form to use if you like.