Until a few years ago in Poland there used to be a local bus line 666 to Hel, but the number was changed after Catholics complained 🙄
Now Flixbus opened a line 666 from Kraków to Hel, so it’s finally back ;3
source: https://wien.rocks/@rail@flufftech.net/116814922877180816
Finnair used to have flight AY666 from Amsterdam straight to Helsinki (HEL) but only every Friday the 13th.
They do still have flights from Singapore (SIN) to HEL. But that’s just normal. Don’t worry about it.