You can now book incredibly cheap flights with a new app that lets you bid on unsold airline seats

• Air Ticket Arena is a UK-based start-up that launched in February.• It lets you bid on unsold airplane tickets up to two weeks before the departure date.• It's only available on Android, but will be available on iOS next month. If, like 24 per cent of Britons, you are a chronic procrastinator - we may …