Ok we are flying from Billings, MT to Miami, FL in Dec and I have a few questions. We are traveling with a 3 year old and 18 month old(lap child). No fumes about the lap child please. We have 2 Radians and a Nautlis. We have at least 2 lay overs on the way there and about the same on the way back. When we get to FL we will not be in the car much. Same on the way back. What are your suggestions to make it easier. Is there a travel vest that we can get for DD(3) that will work for the car and she can use DS(18m) seat on the plane? I do not want to break the bank but make it easier on us and them. HELP!!!!!!