I know that the main hub of SK is in CPH, and therefore flights to/from CPH are spoken in Danish. But I wonder what is spoken , used by cabin crew and Captain, when the flight is say from LHR to STO or OSL? Would it be Swedish or Norwegian? What about a flight from STO - OSL then? Swedish or Norwegian? Or neither? Or both? Or in Danish ?

I know that between domestic Norwegian / Swedish flights, it would obviously be spoken in the local language.. but I wonder about the rest...

I don't speak either .. so am just wondering that's all !