In order for Europe to have a successful summer of international tourism, even involving only intra-European travel, several things need to happen:

1. Borders need to be opened. This looks like happening shortly, but assurances need to be given that they will not be closed again, forcing cancellations.

2. Transport infrastructure needs to be reliable. Airlines need to be flying and need to be able to do so in an economically viable way.

3. Hotels need to be fully functional. This means minimal intrusion into the guest experience.

1.5m between tables? No problem. Attendants doling out food at buffets? No big deal. Table service only for coffee? Bring it on!

Pools closed? No gyms? Restricted access to facilities? Health checks with threats of being turned away? Not going to fly. The place will be empty.

4. Restaurants and bars need to be open, with minimal restrictions. Otherwise, too many people just won't bother.

5. This is the big one. 14-day quarantines have to stop. Virtually nobody is going to self isolate for two weeks, even on their return home, for the sake of a week in the sun. Simply not going to happen.

Some serious decisions are going to have to be made in the very near future. The simple fact is that Europe can either have tough measures or a summer tourist season. Not both. Governments are going to have to decide which one they want.