EVen though airlines will let you fly with holding someone under 2 I have ALWAYS bought my children a seat. They only charge you 50% for the infant seat and it's the best thing!! It gives everyone some personal space and if you hit turbulance it's a must!! When we flew doen to Orlanco in Dec, we hit some MAJOR turbulance and if I had been holding my son he probably would have went flying, it was that bad. Of course he was safely buckled into his car seat and slept through it. It is definately safer to get your child a seat and just remember the next time you fly your child probably will be over 2, so you'll have to buy a seat then, so why not now.