I actually see him as much more of a fast slipper launch type of chap, with silk flying.
However, I do believe he had a sojourn in a Flying Boat in one of his adventures, with Algy, Ginger and Fee Wong. Here
Biggles is in fact a fearsome Mog, intrepid bird swallower, garden bird table goal hanger, suave and sophisticated at feed time, a fighting furball disturbed off the duvet.
He hates any form of transport except aviation in the form of gliding toward aforementioned bird table. Has also been known to defend the property (his) to a bloody stump, and can sleep for the Narcoleptic Society.
Henry and Tubbs are of a similar disposition although Tubbs (on the right) has a low concentration span and appears to forget things quite a lot. He is a master in the art of opening doors but all lessons in shutting them have met with spectacular failure