I have a Bike Friday that fits in a suitcase that I can check in as regular luggage. A few years ago I took it with me on Southwest from California to Maryland. When packing it, I took pictures of each step and a final picture of how it was all packed in at the end. I printed the pictures out and put my name and cell phone number with a note to TSA to contact me in case they had problems getting it all back together. This all went in the suitcase with the bike. The bike made it to Maryland fine and it didn't look like anyone had opened it. When I got back to California, it looked like someone may have looked through it but everything was still fine. No problems..