Two widely separate incidents of last week may be forerunners of a new mode of air transportation.

At Berlin, the Raab-Katzenstein airplane makers hitched a motorless glider to the tail of a regular plane. To the tail of that glider they hitched a second glider. This "train"—the air equivalent of a motor truck with tandem trailers—taxied across the field and managed to take off, the plane tugging, the gliders lunging after. Soon the "train" straightened out in smooth flight and without difficulty attained an altitude of 1,200 ft.

By and by the pilot of the rearmost glider cut loose from the train...

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