Originally Posted by BruceMetras

Here's the text from their website .. pretty much what Thor said, it depends on the plane/airline:

@tommylane we’ve found that it really depends on the airline. Southwest is generally great about everything so we usually fly with them.
We’ve had good experiences on American and United Express/Skywest. Even got the captain riding around on the tarmac on a small commuter flight in California.
US Airways this weekend was a mixed bag. In Phoenix they were cool about it, but asked us to gate check with return to the gate on landing which was good. At JFK there was a person posted outside the security line intercepting people who had bags that looked like they wouldn’t fit in the sizer. US Airways charges everyone for checked bags so it appeared to be a fee recovery program there.
In any case the Dimpa bag is a good thing to carry since if the bike has to go below, it has some protection and nice carrying handles. Then when your not using it it’s light and folds up very small. And it’s also totally disposable since it’s so cheap.