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(Bloomberg) --London’s Heathrow airport said it’s working with the U.K. government on a plan that would allow people flying in from countries with a low incidence of the coronavirus to avoid controversial quarantine restrictions.

Heathrow has give a positive reception to proposals for so-called “travel corridors” put forward by the Department for Transport’s restart and recovery working group, according to a spokesman for Europe’s busiest air hub.

The corridors would allow free movement between low-risk cities or countries and could hold the key to restarting flights in Britain after the government’s plan for 14-day isolation periods was criticized by airports and airlines as likely to put people off traveling altogether. Details of the quarantine plan have yet to be revealed, though it’s due to be implemented next month.

“Instead of a blanket quarantine approach which would prolong economic uncertainty, the DfT have worked with us and industry to develop a proposal for a risk-based model,” Heathrow said in a statement, adding that a similar system has been successfully introduced in Hong Kong.

The DfT said the aviation sector is crucial to the U.K. economy and that it’s exploring options for reviving transport operations, without commenting on whether the travel-corridors plan is likely to become official policy.

“We continue to look at the best ways to restart all forms of transport, while also ensuring we limit the risk of creating a second wave of cases,” it said in an emailed statement. Ministers are in regular contact with senior figures in the aviation industry to discuss challenges and support, the department said.

Heathrow, the home base of British Airways, will also begin trialling thermal-screening technology for arriving passengers this week, the spokesman said, and is handing out face masks both to incoming and departing travelers.

Neither measure has been endorsed by the government, but combined with the corridor approach and developments such as contract tracing, they may provide authorities and the public with sufficient confidence for a resumption of flights.

Operations at airports across Europe are likely to remain limited through June, so that Heathrow is targeting an anticipated ramp up starting in July for when the various steps might come together.

Other options include an immunity passport for those testing positive for Covid-19 antibodies, while the hub will also trial ultra-violet sterilization of security trays and contact-free security screening equipment, with results to be passed to the government.

Heathrow Chief Executive Officer John Holland-Kaye has also told Bloomberg that two-meter social distancing is unsustainable at airports as it cuts capacity to 20% of the usual level, and that the combination of checks and hygiene enhancements should allow such restrictions to be removed as traffic builds.

Ryanair Holdings Plc, which has its biggest hub at London Stansted airport, reiterated its opposition to the quarantine plan Monday, saying the proposals aren’t based on solid science and in any case couldn’t be practically implemented.

“I think it will largely, over the next three or four weeks, be removed in favor of something that is effective, which is face masks and temperature checks,” CEO Michael O’Leary said in a Bloomberg TV interview.

In France, Paris-Charles de Gaulle airport is already deploying infrared cameras to screen passengers for fever when they arrive in the French capital. Aeroports de Paris has bought a dozen of the systems that can scan as many as 16 people per second.

The airport plans to rely on airlines to carry out temperature checks at the point of departure.