text: In formation flying, this sort of interference 
  must be appreciated and anticipated. In cross- 
  ing under another airplane, care must be 
  taken 
  trim change and 
  adequate clearance must be maintained, other- 
  wise a collision may result. The pilot of the 
  leading aircraft will know of the presence of 
  trim change 
  the 
  experienced. Obviously, some anticipation 
  is 
  necessary and adequate separation is necessary 
  to prevent a disturbing magnitude of 
  trim change. 
  the leader will be able to “feel” 
  the presence 
  of the slot man even though the airplane is 
  not within view. Obviously, 
  the slot man 
  formation 
  will have a difficult 
  maneuvers because of the unstable trim changes 
  
  to anticipate  the 
  
  interference 
  previously mentioned, there exists the possi- 
  bility of strong interference between airplanes 
  in supersonic flight. 
  In this case, the shock 
  waves from one airplane may strongly affect 
  the pressure distribution and rolling, yawing, 
  and pitching moments of an adjacent air- 
  to express general rela- 
  Pl ane. 
  tionships of the effect except that magnitude 
  of the effects will be greatest when in close 
  proximity at low altitude and high 4. General- 
  ly, the trailing airplane will be most affected. 