In terms of air travel the EU/U.K./Iceland/Swiss/Norway need to come together and see how best to open up whilst protecting against countries well behind Europe such as Russia and Brazil and hopefully if the majority now more educated in what this pandemic involves use common sense hopefully we never see the second spike. If it does I don’t expect it will be until November time so hopefully will buy some
time if it does rear up to get vaccines/treatments.
The problem with that is the inclusion of the UK! The rest of the nations you have mentioned (and before any bright spark pipes up, I know the EU is not a nation!) are at roughly the same point in the progress of the disease, the UK is weeks behind. Almost all the countries except the UK have daily new infections in the 100s, some in the 10s; one at least (Slovenia) is now declared virus free.
The UK has a way to go before the European mainland (and if it weren't politically sensitive, the Irish Republic) should be looking at treating the UK the same.