Ryanair has announced a plan to restore 40 per cent of its flight schedule from July 1.
The airline said the measure is subject to government restrictions on flights within the EU being lifted and "effective public health measures" being put in place at airports.
It would involve nearly 1,000 flights per day being operated and 90% of its pre-Covid-19 route network being restored.
Crew and passengers will be required to wear face masks or face coverings, and pass temperature checks.
Queuing for toilets will be banned, but "toilet access will be made available to individual passengers upon request", according to the airline.
Refreshments available to buy on board will be limited to pre-packaged items, and sales will be cashless.
Ryanair said all surfaces in its cabins will be disinfected every night with chemicals which are effective for more than 24 hours.
The carrier will require all passengers flying in July and August to complete a form when they check in, stating how long their visit will be and where they are staying.
This information will be provided to EU governments to "help them to monitor any isolation regulations they require of visitors on intra-EU flights".
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Ryanair chief executive Eddie Wilson said: "It is important for our customers and our people that we return to some normal schedules from 1 July onwards.
"Governments around Europe have implemented a four-month lockdown to limit the spread of the Covid-19 virus.
"After four months, it is time to get Europe flying again so we can reunite friends and families, allow people to return to work and restart Europe's tourism industry, which provides so many millions of jobs."