If you're flying with TUI, you can now select your seats and check in on the go using your mobile device. TUI flight numbers begin with TOM. Simply log in to Flight Extras to select or upgrade your seats, provide your API information, and check in for your round trip. If mobile boarding passes are available for your route, you'll just need to save these to your smartphone. Once you get to the airport, show them to our staff at the bag drop desk, security, at the boarding gate, and to our cabin crew onboard the aircraft. That said, if you'd prefer to use paper boarding passes, you can print them off from the PDF attachment that we'll email to you. You'll need to print each boarding pass clearly on an individual piece of A4 paper. If you can't print your boarding passes, you can collect them from any TUI Holiday Store, or from the TUI bag drop desk when you arrive at the airport. If mobile boarding passes aren't available on your route, you'll need to print them off from the PDF attachment that we email to you, and take them with you when you travel. If you'd like us to email your boarding passes to you again once you've checked in, you can log back in to the website and select the resend option at any time.