I only took a car seat on a plane once for either of my kids and it was such a hassle I've never taken one again. My kids always thought it was very special to get on the airplane and sit in a seat like a big person and put their own seat belt on. It also makes it easier to use the tray table for playing. Never had a problem with over 50 flights.
If you do take the car seat PLEASE, PLEASE do not let them kick the seat in front of them. Car seats put their feet, especially with the older kids, very close to the seat in front, so either stop them or have someone you know sit in front of them.
If you do take the car seat PLEASE, PLEASE do not let them kick the seat in front of them. Car seats put their feet, especially with the older kids, very close to the seat in front, so either stop them or have someone you know sit in front of them.