The Citation III was the first Citation with swept wings and a T-tail. It can be distinguished from similar bizjets by its cockpit windows, squared off oval cabin windows, large thrust reverser fairings and bullet fairing on top of the vertical stabiliser.
The Citation Sovereign could be regarded as a stretched Citation Excel. However, it is a lot bigger, the wings have a slight seeep angle and the cruciform tail looks a like that of a Lockheed Jetstar.
The Citation Latitude is a new design, although some elements in the external appearance look familiar. It looks most like a shortened Citation Sovereign, with bent-up wingtips and the delta fins of the Citation Excel. There are only four cockpit windows, so not looking like the six originally developed for the Citation III.
The Citation Longitude has the four cockpit windows of the Citation Latitude. The engine nacelles have no external fairings for the thrust reversers. The T-tail has a dorsal fin with a small air intake at the front. Typical are strakes under the horizontal stabilisers. The wings have curved winglets.
Being at one time the fastest civil aircraft on earth its sleek lines are recognisable. It looks like an enlarged Citation III with huge engines, long, slender wings, a large wing-body fairing and a large bullet fairing on top of the vertical tail, pointing backwards.
The Cessna Denali very much looks like the PC-12. The air intake and nose gear of both aircraft are a bit different, but it is easier to look at the tail area. The Denali has a smaller dorsal fin than the PC-12, no ventral fins and no bullet fairing in front of the horizontal stabiliser. (photo Textron Aviation Inc.)
The Pressurized Centurion has non-braced wings and rectractable gear like the standard Cessna 210, but smaller, rectangular cabin windows with rounded corners.
In this twin jet trainer the student and instructor sit side-by-side. Most trainers have a tandem cockpit. Additionally, the T-37 has engines in the wing roots, at the side of the fuselage, with exhausts immediately after the wings. A cruciform tail completes the list of key features.
This looks like a scaled down Challenger 600 series, with engine nacelles with a single exhaust. A distinctive feature of the bizjet is that the cockpit side windows become narrower towards the end.
The Challenger 600 series is characterised by the very streamlined, pointed nose and rounded cockpit windows with constant height. Most version have engine nacelles with separate exhausts for the fan and the core air flows.