Flip-flops on a plane flip-flops in the car flip-flops at the wedding flip-flops when I go sledding flip-flops on a plane

Nay - compression socks and shower sandals to change (if you bring them anyway) on long flights. Otherwise approach shoes.

While I don’t wear shoes for the main portion or the flight usually, I always wear running shoes for take off and landing as those are the most likely times where a problem can happen, and if you need to evacuate, flip flops or bare feet will not be too good to escape a bad situation.

You’ll never see women wearing flip flops anywhere but around the pool and beaches all over the World. US is an exception because most women here don’t care how ridiculous and unsanitary it is to wear flip flops everywhere.