Principle  of  refuelling  of  airplanes  in  air,  as  a  whole  much  more  safe  than  the  standard  one.  Use  prospects in  the  civil  aviation  exists.

Shulga V.I.

https://shulga.tripod.com/mixt_2/aerotank/E.htm

The main idea.

The tanker is behind of the fuelled airplane.

Here, the basic complexities of synchronous flight ("taxing" and monitoring flight in the disturbed stream) and also consequences of unnominal situations concern to the competence of experts - professionals in this respect. The structure of their airplane can be adequately reinforced. Eventually, the tanker crew can have parachutes...

Naturally,  it is necessary to put the additional equipment on the refuelled machines. In the tail part a pump plant should be installed, which "picking up" fuel delivered by tanker, and a fuel hose itself (or its part).

However, as a whole, basic facilitation and simplification of the functional role of the refuelled airplane can appear solving at the choice for the benefit of this version.