On bluesky and Mastodon, My profile pic is a shot taken from the home of very dear friends in the Republic of San Marino, a country with no real airport. Their twin Heads of State are elected by popular suffrage, and I've occasionally checked Sammarinese newspapers online for info about election campaigns and results. I've also read a really interesting short history of the country, by a sammarinese resident, in Italian.
On my last trip there, I got an official RSM stamp in my passport, a tourist gimmick that amused the Sammarinese friend I was staying with and which he thought was a waste of (then) five euros. A few weeks later, flying home out of Fiumicino, an Italian customs officer saw the RSM stamp in my passport and was confused. He said "how did you fly into San Marino?"
So when an author calls the RSM a 'principality' and has a character say they're "flying there tomorrow', it takes me out of the story. Don't just pick a random micro-state and hope nobody will know and/or care.
