Finnair told another British publication, The Independent, that the change was not due to a concern that superstitious passengers would avoid the flight, but that the growing airline needed to reorganise flight numbers.
But Finnair's flight AY666 to HEL, which ferries passengers from from Copenhagen, Denmark to Helsinki in Finland, has been going strong for more than a decade.
Some people would avoid flying altogether on Friday the 13th.
'In 11 years, we've flown 21 times the AY666 flight to HEL on Friday the 13.
Finnair Flight 666 into HEL will make its final destination journey today, as the flight number will be renamed as part of the airline's route restructuring. As the carrier is switching around some flight numbers later this month, Flight AY666 will become AY954.
The flight has been a long-running source of amusement for the pilots.
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Pilot Juha-Pekka Keidasto once said: "It has been quite a joke among the pilots. It's only a coincidence for me".
The last time the flight happened on Friday the 13th was in January.
The Flight number, 666, is widely known as the biblical "mark of the beast" mentioned in the apocalyptic Book of Revelation, and refers to the Antichrist who wreaks havoc on the earth before the second coming of Christ.
The fear of "Friday the 13th" is called friggatriskaidekaphobia.
The fear of the number 666 is hexakosioihexekontahexaphobia.