When you complete your checkin, you will be given an option to add the pass to your Passbook (aka Wallet app). Tap into that, then press the Add button to add the pass to your wallet. Then you can skip the check-in kiosk at the airport if you have your phone and the pass handy. Choose to have your boarding pass sent directly to your mobile device via email or through the mobile app for qualifying itineraries. No printing is necessary. Once you receive your boarding pass, simply scan the barcode on the screen at airport security checkpoints and at the gate during boarding