Seven M-2's were built in 1929, five as mailplanes for Varney with 525 hp Wright "Cyclone" engines. They had a mail pit in place of the front cockpit. These were called "Speedmail." Another built for Varney had a 2 seat front cockpit and a smaller mail pit. The last M-2 built was a 3-seater with a 525 hp Pratt & Whitney "Hornet" engine. The M-2 is the famous "Bull Stearman." There is one M-2 still in existence. Hopefully it will be restored.

Three LT-1's (Light Transport) were delivered in 1929 to Interstate Airlines. Powered with Pratt & Whitney 525 hp "Hornet" engines the LT-1 was essentially an M-2 with a four-seat cabin instead of the front mail pit or cockpit. The pilot sat outside in his open cockpit. Such adaptations were not acceptable to passengers as contemporary monoplanes had roomier cabins. The LT-1 concept was soon abandoned.

Named the "Coach" the CAB-1 with a 300 hp Wright J-6-7 engine was a late 1929 try for a more acceptable five-seat cabin biplane than the LT-1. It's features included better visibility, more headroom, and the pilot at the front of the cabin. The Coach didn't get to prove itself in commercial aviation before the depression wiped out the market for big passenger biplanes.

The Model 80 of 1933, with the 420 hp Pratt & Whitney "Wasp Jr." engine was a development of the Model 4. One of the cleanest old-style biplanes ever built, the 80 marked the end of the line for open biplanes in US Commercial aviation. It had wire-braced landing gear, an enclosure for the pilots rear cockpit and a removable cover for the front cockpit.

Only one Model 81 was built and it was identical to the Model 80 except for having the pilot in the front cockpit and a single canopy covering both cockpits. After an unsuccessful South American sales tour, during which it was demonstrated both on wheels and floats, the Model 81 was sold to the Mexican Government in 1933.

The last of the classic Navy Scout-Observation biplanes was the Stearman X-85. It was delivered in 1938 as the XOSS-1. Although biplanes were almost extinct as first line Navy equipment in the mid 1930's, the Navy ordered the XOSS as a backup to new experimental monoplanes ordered at the same time. With a 585 hp Pratt & Whitney "Wasp" engine the two-seat X0SS had metal frame wings with fabric cover and a metal monocoque fuselage. The XOSS could operate on wheels or floats. The seaplane version (below) could be catapulted from ships.