The number of aircraft assigned to a squadron varies depending on the type of squadron and the nationality.
For World War Two, most of the time:
United States:
Army Air Force-Fighter Squadron is 25+
Army Air Force-Bomber Squadron is 12 to 16
Navy Fighter Squdron is 16 to 32
Navy Dive Bomber, Torpedo Bomber or Scout Bomber Squadron is 12 to 18
Japan:
Army Fighter or Bomber Squadron (Chutai) is 9 to 12
Navy Fighter or Bomber Squadron (Chutai) is 6 to 12
RAF Fighter Squadron is 12
RAF Bomber Squadron is 6 to 12
France 1939-1940:
Army Fighter or Bomber Squadron (Escadrille) is 9
Luftwaffe Fighter Squadron (Staffel) is 12
Luftwaffe Bomber Squadron (Staffel) is 9
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There is no "the" since there are infinitely many non-parallel planes. Two non-parallel planes are planes that intersect in a line.
Infinitely many planes.
Eight.
six