How to build an air-fueling aircraft? [RELATION]

Air refueling aircraft are no longer a luxury for the fewer club of the richest states. They are becoming increasingly common for respective reasons. Firstly, they let for much more efficient usage of the costly fleet of combat aircraft, multiplying their value at a price lower than the acquisition of further combat machines. Secondly, in the world, there have been solutions to usage specified machines not only as “flying tanks”, but besides for transporting people and cargo, VIP machines, flying hospitals or medical evacuation aircraft. The answer is so versatility, which combines low operating price and good cost-effect ratio.