The first digital vaccine certificate is set to be launched by the world's airlines this month as part of a four-step plan for summer holidays being considered by the Department for Transport (DfT). The Travel Pass app, developed by the International Air Transport Association (IATA), will allow passengers to present pre-departure test or vaccine certificates on arrival at their destination, enabling them to sidestep quarantine or other restrictions. IATA is in talks with the DfT over the app, to which immunity certificates for those who have had Covid but have not been vaccinated could be added. It will be trialled by 10 airlines including IAG, which owns BA, Qantas and Singapore Airlines, starting initially with pre-test data but ready to be adapted to include vaccine certificates once they are digitised. At present, most countries are using paper to confirm people's inoculations, which the airlines are concerned could delay the introduction of a travel pass with both vaccinations and test data and lead to lengthy queues at airport immigration desks. The app is part of a four-stage approach IATA has proposed to the DfT that would see international travel restart in May, with pre-departure testing or vaccines being used for entry to a country before the eventual removal of all restrictions to allow free travel between "green list" countries. It proposes three tiers of countries including a "red list", where there may still be quarantine and pre-departure testing, an "amber list" where quarantine is replaced by tests or vaccine certificates, and a "green list" where travel corridors between low-risk countries could allow unrestricted travel.