"Avro York. Without its contribution to the Airlift" - TBH I syspect if it hadn't have been there Berlin would still have been supplied by a never ending stream of US freight aircraft
There was an enormous stream of US aircraft, of course. But they couldn't have kept it up alone. The figures show that the USAF delivered some 1.8 million tons, while the RAF delivered 550,000. Not a bad contribution.