A Ju52 by Revell would certainly be easier to aquire than a Fokker F7 or a Ford AT-5 Trimotor! Actually, the only Trimotor I know of is an ancient Monogram kit in 1:72nd scale including a dogsled and some polar explorers (curiously, though, I seem to recall that Adm. Byrd used a Fokker rather than a Trimotor).
Scale is okay, too. Suitably imposing, and you can chase the evil/good guy (delete as applicable) beneath the wings, with the villain stumbling into the running prop...
Otherwise, a DeHavilland Dragonfly would be fine, but as said, 1930sī civvie planes are notoriously hard to come by in 1:48.