I don't have a definitive answer for you, but I'll be flying to Mexico on Friday and I can tell you what I plan to do...
I think that a filled carto should be fine on a pv, since there is no "free" liquid floating around, but clearos should be checked or in a liquid bag. I'm going with that, and I hope I'm right!
When are you travelling? I can check back in with my experience in two weeks.