SeatBoost is a free iPhone app that allows you to upgrade your seat through live, last-minute auctions. With SeatBoost, you have the opportunity to bid for an upgrade to your desired class, starting 24 hours before your flight.

To get started, simply download the SeatBoost app and check if your flight is eligible. Once you find your flight, join the live auction and place your bid. You can bid for yourself as well as your traveling companions. If you win the auction, you only pay for the upgrade at the end of the auction.

Currently, SeatBoost is available on TAP Air Portugal, with plans to partner with more airlines in the future. To stay updated on new partnerships, you can sign up for their email list on their website.

For any questions or inquiries, you can visit the SeatBoost website and use their contact form.

Please note that personal data disclosure is available on their website's privacy policy page.