Military Changes Aircraft Markings
MARCH 27--The original designations of aircraft were changed to two letters and a number of which the first letter denoted class, the second type within a class, and the number the order in which aircraft within class were acquired. Four classes were set up; A for all heavier-than-air craft, D for airships or dirigibles, B for balloons and K for Kites.
Within the A Class, the letters L, H, B, X and C represented land machines, hydroaeroplanes, flying boats, combination land and water machines, and convertibles respectively. Thus the third hydroaeroplane, formerly A-3, became AH-3, and the first flying boat, formerly C-1, became AB-1.
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