Not in the US you don't. Buy a ticket under "John Doe." Retrieve boarding pass. Print a copy. While you still have it open, photoshop it (or edit the HTML, whatever) to say "Bob McTerrorist". Show your photoshopped boarding pass and your "Bob McTerrorist" license to the TSA. Clear security. Discard your photoshopped boarding pass. Retrieve the boarding pass copy from step 3 above. Present it to the gate agent and board the plane.