The flight started 11 years ago and has fallen on Friday the 13th 21 times with no reported ill effects. For example Britain's Daily Mail asks, "Would you want to board flight 666 to HEL on Friday 13th?"
The plane landed safely at Helsinki airport (code HEL) at 15:55, but not before it had become a viral sensation. Friday the 13th is known as an unlucky day in Western culture, so mix that with the Mark of the Beast and you could end up with some pretty uncomfortable passengers, especially since the flight goes straight to HEL.
"Farewell to Finnair AY666", wrote the airline, "but remember, we still have a flight from SIN to HEL".
However, the airline isn't done with eerily matched flights.
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"AY 666 from Copenhagen to Helsinki will become AY954" on October 29, the company explained. Getting in on the fun, the Helsinki Airport later responded to a second Flightradar24 tweet asking the airport if the plane would be landing at Gate 13.
The fear of the number 666 is hexakosioihexekontahexaphobia.
No more superstitious flights for those fearless passengers.
Veteran pilot for the airline Juha-Pekka Keidasto told the Telegraph previously that he was not scared about flying on Friday the 13th. "It's only a coincidence for me", he added.