Amazing - it's a living museum. Here's their fleet, copied from their website:
BUFFALO AIRWAYS AIRCRAFT FLEET
Lockheed L-188 Electra Freighters
Douglas DC-4
Douglas DC-4 Tankers
Douglas DC-3
Curtiss C-46
Canadair CL-215
Canso
Baron
King Air
Travel Air
Cessna 185
Norseman