sentences:  One DC-6 was re-configured with a swing tail unit for cargo transport purposes and stayed with the airline until 1980, mainly operating freight flights for Finnair to the UK and other European destinations, when cargo flights were taken over by Finnair (as Aero O/Y was named by then).In the same year, the airline underwent another rebranding, being known as Karair, also styled KarAir henceforth.Over the following years, Karair reduced its fleet, because charter contracts with Finnair had been terminated.