KB-29 Tanker

      The newly formed Strategic Air Command quickly realized that it needed the means to extend the range of its aircraft.  This resulted in the decision to create tankers.  The B-29 was chosen as the first model for experiments.  It first use the drogue system developed by the British in which a fuel line was dragged behind the tanker.  The other plane had to catch it.  It was an unwieldy system and the transfer rate of the fuel was too slow. 
    Boeing developed the flying boom system, in which the boom was "flown" by a boom operator.  It proved so successful that it has been used ever since.