Originally Posted by Rob_E

Obviously if it's a concern for you, you should do what you're most comfortable with.

I fly about once a year with a bike, but have only recently switched to tubeless, so I don't have the experience to say what the odds of their being a problem is. I will say that the luggage with my bike in it has frequently been opened up, but I've never been left with the impression that they peaked within the tires. I also have never taken a bike outside of the U.S.

Originally Posted by Rob_E

I do enjoy tubeless tires, and it's not really a weight issue, although I generally think a tubeless tire will be lighter (and I imagine the difference between tubed and tubeless increase with the size of the tire). It's about how the tires feel, and it's about built-in flat protection without the need for Slime tubes, which I've never cared for. I don't know why sealant in the tire seems more acceptable and less bothersome than slime tubes, but somehow it does. I like it enough that I'd probably jump through a couple of extra hoops to make it possible to keep my tubeless set-up, as long as it didn't compromise the success of my trip. So if I were really concerned that sealant in the tires would create a problem during air travel, I'd just remove the sealant and replace it at the other end. But if you're not noticing much of a benefit to using tubeless, then obviously any effort spent maintaining a tubeless set-up is too much. And the narrower the tire, and the higher pressure the tire, the less benefit I feel I'd be likely to notice. But since the OP is buying a bike that comes tubeless, I'm assuming it's going to have tires that where a tubeless set-up will have some chance of being beneficial.