One of the eight Lockheed 12As operated by the Brazilian Army Aviation Service. Photograph of it (c/n 1235) taken on 18 November 1939 at Afonsos airfield, Rio, against an interesting background of (left to right) a Vought V.65B Corsair, a Bellanca 31-42 Pacemaker, a Waco EGC-7 and two Vultee V-11GB2s.

The Northrop N1M in its initial configuration, showing the control surfaces in the downturned wingtips, undergoing weight and balance checks at the main Hawthorne plant, early 1940.

Two illustrations from the original Northrop brochure describing the operation of split surfaces.

The photograph of the Fairchild 91 PP-PAP in service with Panair do Brasil. The example acquired by the RAF may in fact have been c/n 9405, purchased from Gar Wood.