It isn't required, but really, would you drive at home with your 5 year old in the car without a booster seat? I wouldn't and don't at home or there. It is little or no trouble to gate check your booster seat and have it for your trip.
I always ask myself how I would feel if something happened and I choose not to be inconvenienced by the hassle - because while it is an inconvenience, it isn't that bad.
Whatever you decide - have a great trip.
Last edited by jrudq; 08-14-2012 at 07:33 PM..