Demonstration of mid-air refuelling system in use between planes over Berlin.
Full title reads: "Berlin. Sky petrol stations soon? German aeroplanes are being regularly refuelled in mid-air over Germany's capital."
A German speaking pilot explains how the mid-air refuelling system works. He shows the pipe through which the fuel flows.
Two planes take off. Air to air views as the fuel pipe is lowered from the upper plane / tanker to the lower plane.
Closer shot as man out of top of lower plane grabs pipe and fixes it to fuel tank (presumably faked shot). Shot of planes flying with fuel pipe linked between them.