The 1929 Alexander Hallett were A-2 with 130hp Hallett engines. Three were built; N6354, N6359, and N7981, converted to A-1.

The 1926 Eaglerock Long-Wing (ATC 8) as designed by Al Mooney and Daniel Noonan. This second design built by Alexander featured unequal spans. One powered by 220hp Wright J-5 was for the 1927 Ford Air Tour.

Priced at $2,750, two hundred and five Combo-, Long-, and Short-Wing models were built during 1926-27, but subsequent production unrecorded. Some were built by Aircraft Mechanics Inc.

Engine: 90hp Curtiss OX-5
Wingspan: (upper:) 36’0″ (lower) 38’0″
Length: 24’11”
Useful load: 760 lb
Max speed: 92 mph
Cruise: 80 mph
Stall: 35 mph
Range: 380 mi
Seats: 3-4

The 1926 Aircraft Mechanics Eaglerock Combo-Wing (ATC 7) three-place open cockpit biplane was also offered as the Short-Wing with 30’0″ span. Priced at $2,750, it was also available with a 100hp OXX-6 engine.

They won 2nd and 3rd places in the 1927 National Air Derby.

Eaglerock Combo-Wing
Engine: 90hp Curtiss OX-5
Wingspan: 36’0″
Length: 24’11”
Useful load: 760 lb
Max speed: 100 mph
Cruise: 85 mph
Stall: 38 mph
Range: 395 mi
Seats: 3

The 1929 Alexander Eaglerock A-15 (ATC 190) three-place open cockpit biplane was a long-nose “Anteater” with a long motor mount. Priced at $4,157, and $3,907 in 1930, about twenty were built. NC6232 was converted from an A-2, and NC8294 was the prototype.

Eaglerock A-15
Engine: 100hp Kinner K-5
Wingspan: 36’8″
Length: 24’11”
Useful load: 917 lb
Max speed: 100 mph
Cruise: 88 mph
Stall: 38 mph
Range: 500 mi
Seats: 3

Fourteen 1930 Alexander Eaglerock A-14 (ATC 2-103) were built, priced at $2,000 less motor. Three-place open cockpit biplanes, one was converted from A-11 NC6315, another, N203Y, might have been a conversion from an earlier model.

Eaglerock A-14
Engine: 165hp Wright J-6
Length: 25’11”
Useful load: 937 lb
Max speed: 118 mph
Cruise: 108 mph
Stall: 40 mph
Range: 600 mi
Seats: 3

Eleven 1929 Alexander Eaglerock A-13 (ATC 141) were built, priced at $6,096.

Engine: 170hp Curtiss twin-row Challenger
Wingspan: 36’8″
Length: 24’6″
Useful load: 945 lb
Max speed: 117 mph
Cruise: 100 mph
Stall: 40 mph
Range: 600 mi
Seats: 3

The 1929 Alexander Eaglerock A-12 (ATC 139) was designed by Ludwig Muther (A-12 to A-15) and priced at $5,849.

Eleven were built, a few of which were refitted with 165hp Comet 7-E under reissued (ATC 2-1).

Eaglerock A-12
Engine: 130hp Comet 7-RA
Length: 24’11”
Useful load: 953 lb
Max speed: 112 mph
Cruise: 94 mph
Stall: 40 mph
Range: 650 mi
Seats: 2

The 1928 Alexander Eaglerock A-11 single-place open cockpit biplane NX6315 was rebuilt as A-14, ended up with Mathewson Airways in Detroit, most likely serving as a mail plane.

Engine: 110hp Warner Scarab