UEFA is delaying matches planned in June.
I guess they expect that large gatherings, travel or just normal sport activity (even crowd free) won't be resumed by then in Europe.
From what I've gathered the plan in Europe is to do a 2 months lock down on / 1 month lock down partially off sequence of sorts for the remainder of the year on a national level.
This gives the national economies some breathing room and people some relief to organize limited social gatherings.
Unless something happens that removes the need for such measures I don't expect borders to open and air travel to resume until after August/September when they'll likely have enough surplus tests and production of tests to test anyone prior to boarding a plane.
That's an idea thrown into some Imperial College paper (granted, a lot of Euro government consulted an expert there) but I'm skeptical about it. I don't think most small business can just turn on / off like that, a lot of shit that got disrupted will take over a month to untangle. I think people, provided the bare minimum of necessities can be met, would actually prefer a longer lockdown than going in and out for a year.
In theory that's not impossible even if the economy get destroyed, I suppose : It would be wartime life, miserable but doable. I want to believe there's a better way to do this but at this point in time it's difficult to tell : We're still in the dark about the virus, the CFR, how potent is the immunity (reinfection has not been entirely ruled out even if deemed very unlikely), medication is on trial, fast tests are still in development and a vaccine is more than a year away.