We always pay for an extra seat and bring our daughter's carseat along with us. Our daughter is 5 years and still fits very well in her Britax Advocate ClickTight. But, she had barely any legroom during our last flight and wasn't able to put her table tray down either. Also, the airplane buckle is right behind her back making it very uncomfortable. We already decided to get the Britax Frontier ClickTight Harness to Booster as our next carseat. Do you think, she would be more comfortable using that on the airplane without compromising on safety? Thank you!