If you've ever flown with TUI, easyJet, Ryanair, or Jet2, you might be able to claim up to a whopping £1,400. While it might sound too good to be true, it's all linked to an old worldwide agreement from 1999, known as the Montreal Convention. Importantly, this convention holds airlines accountable for many things including health harms, flight delays, cancellations and any loss or damage to bags on your flight.