For superstitious travelers, that might be tempting fate. But Finnair passengers on AY666 to Helsinki — which has the 3 letter designation HEL — don't seem too bothered. Friday's flight is almost full.
The daily flight AY666 from Copenhagen to Helsinki falls on Friday the 13th twice in 2013. Friday the 13th is considered bad luck in many countries and the number 666 also has strong negative biblical associations.