what a great site. people seem so helpful here. may i please reach out for advise?

my husband and i are traveling to seoul with our 28 month old twins in june and i have so many decisions that i have to make. i have been going back and forth on:

1. which flight to take. there's a noon flight or a midnight flight. is it better to take cranky tired toddlers to the airport and get them on the plane to sleep for about 6 hours and then anticpate them being awake for another 6 hours until we get to our destination, or...
take the noon flight, attempt to entertain for 7 hours (which will be near impossible with my crazy girls) and then have them sleep for 5 hours until we reach our desitnation where they will no doubt be cranky from lack of sleep.
it seems to be a no win situation for us here.

2. carseat or no carseat....i've read a lot on this but my girls don't particularily enjoy their carseat. i initially thought they would just lie down and sleep on our laps but who am i kidding...



this trip is giving me anxiety....

thanks in advance for your help. i love hearing about other's experiences traveling.