We travel pretty much all the time, and the kids are so used to it so we can pack light and do hand luggage. There are 3 takes that have stood us in good stead for all our travels.
1. The Trunki changed our travel as 3 years ago as sleepy, tired and moony kids to be honest are no fun in airports. Ours kids race each other and love being pulled which makes easier and quicker to get from one gate to the other, or even get through immigration. Secondly, you can keep track of them. Thirdly they may be tired and on the Trunki they always perk up if awake, or I can wake them. No '3' is what I resort to with a sleeping child. Finally, they can pack what they need which has taught mine how to pack, what they have to versus want to take. So they can only take what there is space for in the Trunki, but they need things like under wear and a toothbrush if we are only flying hand luggage (sometime we have checked in luggage and of course it's full of their favourite toys, books and colouring).
2. The Manduca which carries them on your back or tummy, for mine the favourite is the tummy as the love nestling in my boobs. The picture probably does how much I have used this justice, and to beware he/she is probably towards the end of life. However, even in July this year we arrived in Northern Denmark at midnight, because there was no direct flights. On the first transfer the plane was late and then kept the next flight open for 10 minutes to make the connecting flight. So one on the Trunki ( who was still awake), and another in the Manduka. On reflection this must have been hilarious watching a Mummy who already has a size G bust, with a a 4 year old running through the airport; but we made it! After 7 hours of travelling there was no waking the children. So the final walk out was easier.
3. Finally, and as they've grown older these are a god send. I remember when we went to Australia with my youngest and just hauling a car seat it was a nightmare. Rentals charge a fortune, and when you land they often do not have the right one for the age group which infuriates me, as we always pre-ordered. It's a post for another topic as the safety of kids is paramount, but often they do not have the right seat. So 'Mifold' are just genius and fit into my handbag. European safety approved, easy to use, store and whip in and out these have made our travel so much easier.