Thank you @pjprivett . Yes, we always crossed oceans, we have to pass the Mediterranean Sea . We had no problem with AKO for he was given a small amount of sedative to avoid stress-- The longest flight we had was in the is land of Tenerife, Spain . It was around 4.5 hours and we didn´t have any problem what so ever... We only checked him in in the last few minutes before the last call was made.