British Airways owner IAG has said it is "ready to fly" and has called for government action to restart international travel.
Citing a "high level" of pent-up demand, the airline group called for "travel corridors without restrictions" between certain countries.
Some foreign holidays could be allowed when England's lockdown rules ease.
Covid impact
The airline group has been hit hard by the coronavirus crisis, with revenue plunging as many of its planes have been grounded.
IAG reported revenues of €968m (£840m) for the first three months of the year, down from €4.6bn for the same period last year, and an operating loss of €1,07bn.
It repeated its call for digital health passes "to enable a safe re-opening of our skies".
IAG - which also owns Iberia, Aer Lingus and Vueling - is "doing everything in our power to emerge in a stronger competitive position," said Luis Gallego, IAG chief executive.
"We're absolutely confident that a safe re-start to travel can happen as shown by the scientific data."
"We're ready to fly, but government action is needed through four key measures," said Mr Gallego.
The measures the airline group demanded were:
- Travel corridors without restrictions between countries with successful vaccination rollouts and effective testing such us the UK and the US
- Affordable, simple and proportionate testing to replace quarantine and multi-layered testing
- Well-staffed borders using contactless technology including e-gates to ensure a safe, smooth flow of people and frictionless travel
- Digital passes for testing and vaccination documentation to facilitate international travel.
Meanwhile IAG increased its number of cargo-only flights in the three months to 1,306, up from 969 in the previous quarter.
"Cargo has enabled us to operate a more extensive passenger long-haul network," said Mr Gallego. "It generated €350m in revenue, a record for quarter one."
source: BBC News