Hi J.. A couple of things. I travel a lot with children. Most of the time, by myself.will be next week. I have a six year old, four year old and a one year. I travel from Florida to California, or Florida to Ohio or Florida to Kansas, so many trips with three kids by myself and a laptop. This is what i wud do. U have only a 20 minute layover? It may seem like a long time, but what if the plane is late? than u will have to wait for the stroller and put the baby in it and rush to ur next flight which is never fun and they usually board parents with infants 30 minutes b4 the schedule flight. I would get a carrier. You can check your stroller for free with most airlines. Also, i would have booked the flight during the day, only bc if this is the baby's first plane ride, u dont know how she will react to the noise and the atmosphere, she may not like it and scream, and those hours ull be up in air will be when most are trying to sleep, if it was during the day most ppl are talking away and would not notice a baby. For the diaper bag, food for the baby, maybe some of the gerber bisquits. bring enuf diapers as if u'd change her every hour..so if ur in the air for 3 hours, bring 6. Paci, if she takes it a change of clothes for her and an extra top for you..just incase. Take slip-on shoes, nothing with ties that'd ud need to put the baby down...im trying to think of what else.....anyway, if u need more let me know.