We are taking our first family flight in a month and the kids will be 22 months and 4.5 months. They are both flying as lap children. I would like to bring our city mini GT double and check it, but is that a bad idea? We will already have our luggage (checked), the britax carseat and infant carseat...what other tips can you give me for a smooth flight? We are staying with family and I can't decide if I want to bring the bjorn travel crib or not too. What things should I buy in advance to make the trip smoother? We will only be there 5 days and 2 of those are travel half the day.