So far, flights from Denmark have only been allowed to have passengers in every other seat. Now the rules change. People are allowed to sit tighter, in return everyone must wear mouthguards from stepping into the airport until leaving the terminal at the destination.

- If you don't have mouthguards, you don't get a fine, but you can't board the plane, says Danish Transport Minister Benny Engelbrecht to Danish TV2 Lorry.

According to the minister, the mouth guard has a small effect.

- But it's an effect, though. We have a pragmatic attitude to this and, just like before, you should not go out and fly if you have symptoms or feel bad. You should also not face each other when sitting close to the plane, he says.

There will be vending machines

Johnnie Müller, who is security manager at Kastrup, tells TV 2 Lorry that there will be vending machines at the airports where you can buy mouthguards.

With the new guidelines, Denmark follows the recommendations of the European Aviation Authority Easa.