The Avro (later Hawker-Siddeley and British Aerospace) 748 is characterised by large oval cabin windows, a blunt nose, a cockpit with small, narrow eyebrow windows and rounded engine nacelles.
Avro-Canada CF-100 Canuck
The first Canadian jet fighter can be recognised by its straight wings, large engine nacelles in the wings roots, against the fuselage, and the cruciform, straight tail.
Noticable on this aircraft are the relatively short landing gear, low vertical stabiliser with bullet fairing on top, a wide fuselage (giving it a "fatty" appearance) and a pointy nose. Is comparable in size to the DC-9-10 to DC-9-30 series.
The basic Beechcraft model 18 has two radial engines mounted in the wings, a tail wheel undercarriage and and H-tail. This makes it similar two the Lockheed 10, Lockheed 12 and Barkley-Grow T8P-1. The cockpit windows are the best way to keep them apart. The Beechcraft Model 18 comes however in many different versions, of which some can even hardly be recognisable from the original model. Some conversions have a single vertical stabiliser, while others have turbine engines and/or an undercarriage with a nose wheel.
The Beech 1900 commuter aircraft shares many components with the Super King Air series. Essentially it is a stretched Beech 200 with a higher cabin and further spaced cabin windows.
The Starship is a twin turboprop aircraft with pusher props in canard configuration. It has no single vertical stabiliser, but two vertical surfaces at the wingtips acting as vertical stabilisers. This distinguishes the aircraft the most from the Piaggio Avanti.
The Beechjet, and the MU-300 from which it was developed, is a small business jet that can particularly recognised by its cockpit window configuration.
The Beech 99 fifteen-seat commuter aircraft is clearly a descendant of the Beech 65 Queen Air. It is basically a stretched version with the turboprop engines of the King Air and a much longer nose. The Beech 99 retains the square cabin windows of the Queen Air.
Based on the King Air 90 and King Air 100 Beechcraft developed T-tailed versions. These have the same characteristics as the low tail King Airs, such as cockpit windows, round cabin windows, engine nacelles and landing gear, but with a T-tail. Especially the cabin windows make the distinction between a T-tail King Air and a Piper Cheyenne III easy.
The Beechcraft Queen Air has low wings and low horizontal stabilisers, with two piston engines and single wheels on each undercarriage leg. Compared to the Piper Navajo, which has the same general configuration, it has smaller square cabin windows and the main gear retracts forward into the nacelles instead of sideways in the wing. Also look at the cabin windows. The King Air (90/100) is basically a turboprop version of the Queen Air.