Channell Wasson has a new airline legal hard sided case for the Brompton on his website. For frequent airline travelers who want to take a folder along this looks ideal. I frequently take my Brompton M6L with me on flights in a small private airplane, but have been reluctant to check it as baggage on the airlines because of concerns about damage from TSA and baggage handlers. I'm tempted to buy one of Channell's new hardcases and try taking it on the airlines.

As far as concerns about riding long distances on a Brompton, for me it's simply not an issue. The Brompton is very comfortable for long rides. I would recommend the telescoping seatpost option, though.