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.
Beechcraft T-34 (Turbo) Mentor
Beechcraft made a primary training aircraft based on the Bonanza private aircraft. Especially landing gear with triangular main landing gear doors is a key feature copied from the Bonanza, as is the nose of the piston powered version. The fuselage has a tandem canopy, with the student and instructor pilot sitting at the same level. The turboprop version is shown here.
The Beechcraft T-6 is a development of the Pilatus PC-9, and shares a lot of its external appearance. The T-6 has a smaller dorsal fin though, a small ventral fin and a three-piece canopy.
Beriev A40 Albatross
Just one prototype of the Beriev A40 Albatross amphibian aircraft was completed before the project was stopped. The aircraft has an unusual configuration with jet engines on top of and behind the high wings. Compared to the later Beriev Be-200 the A40 is much larger. Further differences include the shape of the nose, location of wing tip floats, bullet fairing and landing gear.
After the failure of the Beriev A40 the company made a smaller version, designated Be-200. Compared to its larger predecessor it has a different nose, engines with separate fan exhaust, no bullet fairing at the top of the tail and more.
The first all-metal Boeing passenger aircraft is somewhat smaller than the famous Douglas DC-2/DC-3, but bigger than the Beech 18 and Lockheed 14 and 18. With all it shares the same external appearance. For easy recognition look for the single vertical stabiliser with its straight leading edge and curved trailing edge.
The Boeing 707 has a lot of different versions, civil and military. All can be easily recognised by the antenna pointing forward at the top of the vertical stabiliser. The similarly configured Douglas DC-8 and Convair 880/990 don't have this feature. The Shanghai Y-10 doesn't have this antenna either, but nevertheless looks very much like a 707 clone, except for the cockpit windows.