Good morning guys!
Some vintage aircraft, biplanes and monoplanes:
WACO Ten (O Series) was the commercially the most succesful model of the company, with almost 1800 aircraft sold from 1927 to 1933. In Brazil, Waco 10 was active with the government side during the 1932 Civil War.
The biplanes of WACO F series were training aircraft with several improvements to be used as light warplanes, even as fighters with the forward cockpid seald with canvas; several were bought mainly by Latinamerican air forces during the 1930s, Brazil alone with 64 airplanes. Despite being reejected by the USAAC in the militray primary trainer program (won by the well known Stearman biplane), WACO F`s main customer was the US Civilian Pilot Training Program, with more than 600 aircraft during WWII.
The most powerful military WACO aircraft was the D series, built specifically for the foreign market. It was a versatile aircraft used as a scout in observation and recce missions, but also as light bomber and trainer. 6 were bought by Uruguay, 4 by Nicaragua and 2 by Cuba.
Northorp Alpha was an all metal, single engine, low wing monoplane for a pilot in an open cockpit and a cabin for 7 passengers or the equivalent weight in mail, designed by Jack Northrop, a talented engineer. The main customer was TWA which used this model from 1931 to 1935 in their transcontinental routes.
Northrop Delta was also an all metal, single engine, low wing monoplane, but with an enclosed cockpit for the pilot (in the first models, only one pilot, from model 1D, two pilots side by side) and a roomy cabin for up to 8 passengers. One aircraft was bought by the US Coast Guard and named RT-1 (aka Golden Goose) and used as personal transport for the Secretary of the Treasury Mr. H. Morgenthau Jr in the late 1930s. Northrop Delta was built (20 aircraft until 1940) under license by Canadian Vickers and used by RCAF as survey aircraft. From Mk. III, Deltas had a modified empenage.
Cheers.