It looks like the exterior dimensions of the Samsonite F'Lite GT 31" hardside bag is 65.0 or 66.5 inches, (depending if you measure at the bottom of the bag or the top). The F'Lite 30" bag measures 61.5", still more than most airlines allow, (61"). I'm also not sure a folder would fit into the 30" bag. I'm leaning toward purchasing a Bike Friday, but am also looking at the Swift and Pacific Reach. I'd also consider an Airnimal, but there don't seem to be any stateside dealers.
Has any airline charged you the oversize fee for your checked bicycle? Which airlines are somewhat more lenient?
For those of you who have a BF, does it fit into the 30" bag?