@Melamona wrote: Does anyone have experience with a Britax Boulevard or Marathon car seat on a flight? Does it fit? NomNom Dog Food Yes, I know I could check it, but prefer not to. It was pricey and it’s the only one we have, so I don’t want to risk damage. I’m not looking forward to lugging it through an airport, but I also don’t want to buy another seat just for the trip we’re taking if possible. Nope. If your child's booster is a high-back booster and the back comes off, you can pack the back in your main luggage for protection and carry on the base. Remember: boosters require lap/shoulder belts so they cannot be used on airplanes, so they get tucked under the seat in front or put in the overhead bin.
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