Flying in the US, this seems normal, not a safety issue at all. I know Germany forbids such landings. Which European countries ALLOW landings at unattended airports. I know Hungary allows it. Where else?
UK does
It’s the most normal of things, pretty much everywhere in the world!
If you mean by unattended ‘no form of ground-air communication’, plenty of these in Spain, non state-run of course. Pilots talk to each other on a published freq.
Italy? Austria? (Considering I’m now based I Austria, I really ought to know the answer!)
Ireland. But you know that already.
Perhaps I should ask who else forbids it.
Not allowed in The Netherlands
Totally allowed in Sweden and the most common practice in GA with hundreds of unattended airports. It is also allowed in Norway, Finland, Denmark and Lithuania AFAIK.
It is permitted in France, with some exceptions like Toulouse Francanzal. On the IFR approach side however, strainght-in approaches are not allowed and circling minima apply. Many airfields are FR-only when no ATC available.
AFAIK there is no law against such operations in Norway but it depends depends on the airport operator. Avinor does not allow it without special authorisation, and without ATC and and rescue services, only VFR operations are authorised. There are plenty airfields where it is authorised, though. I believe it is the same in Denmark and probably in Sweden as well. I have for sure landed at least at one airfield in Denmark with no ATC.