All of the sensible stuff the girls are mentioning

You really need slipper socks for the plane, you take you shoes off and have a stretch and bare feet and your socks can feel yuck after a big flight . Not are how tall you are, however some of the airlines have the extra leg room seats over the emergency exits, these days you pay $300 extra to sit in them, depending on who your traveling with. They are comfy and great fir stretching

Sounds like a great trip