Aircraft
      by Nation
      United States
      Navy/Marine Corps (1911 -1914)
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      When the Navy purchased its first aircraft in 1911, its
      designating system was also a serial number system (identifying both type
      and individual aircraft).  For example, the first Curtiss aircraft
      purchased was the A-1...the second Curtiss purchased was the A-2. 
      The first Wright aircraft purchased was the B-1.
      As long as there were few types, the system
      worked.  The designators were: