Last revised July 6, 2001

AB-1 to AB-5		C-1 to C-5 renumbered. 
AB-6			D-1 renumbered. 
AB-7			D-2 renumbered. 
AH-1			A-1 renumbered. Believed struck off charge 16/10/14. 
AH-2 to AH-3		A-4 and A-3 renumbered. 
AH-4 to AH-6		B-1 to B-3 renumbered. 
AH-7			Burgess-Dunne tailless seaplane. 
AH-8 to AH-9		Curtiss pusher seaplanes 
				AH-8 transferred to Army, and still in Army hands in 1919
				AH-9 was rebuilt and renumbered A83 in the first numerical series. 
AH-10			Burgess-Dunne tailless seaplane. 
AH-11 to AH-18		Curtiss pusher seaplanes. 
AH-19			Originally allocated to a Wright Model G Aeroboat; this was not accepted, so number was reallocated to a Martin Model S seaplane, which later became A68 in the first numerical series. 
AH-20 to AH-21		Thomas seaplanes (renumbered A57 and A58 in first numerical series). 
AH-22			Martin Model S seaplane (renumbered A69 in first numerical series). 
AH-23			Wright Model K seaplane (renumbered A51 in first numerical series). 
AH-24			Sturtevant S (renumbered A76 in first numerical series). 
AH-25 to AH-31		Burgess Model S (AH-25 renumbered A70 in first numerical series). 
AH-61			Gallaudet D-1 (renumbered A59 in first numerical series). 
AH-62			Curtiss R-3 (renumbered A67 in first numerical series). 
AH-65			Curtiss R-3 (renumbered A66 in first numerical series). 
AX-1			E-1 renumbered. 
BC-2 to BC-4		Goodyear kite balloons (renumbered A94, A95 and A151 in first numerical series.