Will I need to bring a seat belt clip with me to properly fasten my son's car seat into the airline seat? I don't want the car seat to be able to move about if my son tries to thrash around while in the car seat
I have never had any problem with the airplane seatbelt that required a locking clip. However, we always keep it clipped on the back of the seat because our rental car always seems to need one!
You need locking clips for shoulder-type seat belts, not the lap-type seat belts. So ... you won't need one on the airplane, but you might on your rental car or limo.