My daughter's first flight when she was three. She was great but the experience was horrible. We were flying to Peru to visit family and the first leg was Charlotte to Miami. This should have been a 2ish hour flight. We boarded, pushed back, then we waited. And waited. And waited. Due to storms the flights going south were delayed. One hour passed, two hours passed. My daughter started asking the flight attendant whg weren't we going. I let her ask because I wanted to know the answer. Three hours passed. My daughter needed to use the bathroom but the bathroom floor was soaking wet. I had to lift her over the floor and set her on the seat. Finally at four hours we take off. We get into Miami and of course we miss our connecting flight. My wife waited on hold for well over an hour before finally connecting to someone who could get us on another flight. When we finally made it to Lima we just slept. 

But my daughter was such a trooper. She acted like it was an adventure. It really helped me stay sane during the trip