Smallest 1/72 scale aircraft is the Czechmaster Canadair CL.227 in resin.
Largest 1/72 scale aircraft would have to be the I.D.Models Lockheed C-5 Galaxy.
Largest ship in 1/72 scale (and probably the largest scale model ever produced for public consumption) would be the Super Ships USS Nimitz class nuclear aircraft carrier. It was sold in two parts, hull & deck in one, superstructure in the other. The modeler had to supply all details. From what I have heard not many were actually produced.
Tom