Make sure you weigh the whole thing (bike, padding, clothes) to ensure it meets regulations for checked luggage; typically, that's 50 lbs. I've traveled by plane with my Brompton packed into the black B&W case about five times now. By the time I include a few extras (tools, spare tire, lubricant, etc. that typically aren't allowed in carry on luggage), it pushes the weight right up to 50 lbs. I typically remove the seat too and toss that into my carry on bag. Depending on the weight of the case you've used, you might be severely limited by how many extra clothes will fit in.