We travel with our little one quite a bit. Quick answers as I am working from my iPhone: 1. good to go with the stroller, no restrictions there. 2. good to go with the bases attached, i recommend getting a flight bag for the car seats t protect them and prevent the bases from getting detached. Something like $15 on amazon. 3. Buddy passes have the same rules 4. 2 bags under 50 lbs each ticketed passenger in addition to the kiddo stroller and carseat side note. We get a ticket for our little one. It's a small price to pay to have her buckled into a car seat in the event of severe in flight turbulence.
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