Yes, you can often bring a folding bike with you onto an airplane. Specific policies vary from airline to airline. Usually, there’s a maximum weight and size allowance, and you may be charged an extra fee. So be sure to read up on your airline’s rules before bringing your bike with you to the airport. (You may have to deflate your tires, remove your handlebars, or pack your bike in a box—all things you’ll want to have done before you arrive at your gate.)