text: INTERFERENCE BETWEEN AIRPLANES IN 
  
  FLIGHT 
  
  During formation flying and inflight refuel- 
  ing, airplanes in proximity 
  to one another will 
  produce a mutual interference of the flow pat- 
  terns and alter the aerodynamic characteristics 
  of each airplane. The principal effects of this 
  interference must be appreciated since certain 
  factors due to the mutual interference may 
  enhance the possibility of a collision. 
  
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