It's easy as long as you prep well.
Make sure the baby is tired for the flight and starting to get hungry, feed them on the plane and then let them sleep for the duration. Make sure you have a dummy or bottle so that the baby can balance the pressure in it's ears.
Once you've landed, it's like being at home but nicer and warmer.
Our daughter is 11 months and has been to Poland 3 times, Ireland twice and Turkey once. She is going to Poland again on Wednesday with her mum while I stay at home and do the DIY. Not once has she played up on a flight as we make sure she is tired and due a feed in time for take off.