As airlines change the way they play the game—like adding basic economy seats and unbundling fares—travelers need a new set of hacks to feel a little more in control. Let's start with TSA PreCheck. Do you have it? Why not? No, seriously, tell us why: We debate its merits, along with Global Entry, Mobile Passport, and something called Clear, all of which can help you get through airport security or customs without having to wait in interminable lines. Plus, have you heard that some airlines now allow for automatic check-in? Or that they'll do biometric screenings—like, scan your eyes or face—to let you on the plane?