The Canadair Regional Jet series are essentially a stretched version of the Challenger 600 series. Later versions are more similar in appearance to the Global series, but have engine nacelles with a separate fan exhaust.
The CASA Aviojet has long, oval shaped air intakes in front of the wings. Also characteristic is the exhaust before the end of the fuselage, below the horizontal stabiliser.
CASA C-207 Azor
Spanish transport aircraft eithout very specific features to recognise it, or it could be the DC-4 like nose gear, including doors. Just look at the details of cockpit/cabin windows, nacelles and tail to distinguish it from similar aircraft like the Martin 202/404 and Convair propliners.
CASA C-212 Aviocar
The Aviocar has a fuselage with a nearly square cross section featuring round cabin windows. The rear fuselage is sloped up to allow easy loading. The vertical stabiliser appears to be tilted forward, as the forward sweep of the trailing edge is larger than the sweep angle of the leading edge. Finally, the C212 has a fixed undercarriage with all single wheels.
The primary market for the CN-235 and longer C-295 is military transport, which is why the aircraft have an upswept rear fuselage, to facilitate loading and unloading. Also characteristic are the two wheels of the main landing gear in tandem configuration, retracting in pod attached to the fuselage.
The Cessna 208 Caravan is a single engine turboprop with a fixed gear and a non-pressurised fuselage. It has large rectangular cabin windows. This type is often confused with the Quest Kodiak, which is very similar in appearance. The easiest way to keep them apart is by the nose. The standard Caravan has air intakes on both sides of the prop spinner, and a large exhaust on the right side of the fuselage.
The Cessna 340 (and 335, the non-pressurised version) can be easily mixed-up with aircraft of the Cessna 400 series. The general appearance is the same, the differences are in the details. The most obvious difference is the cockpit windows. The Cessna 335/340 has a single cockpit window in a long D shape.
Differentiating between most of the Cessna 400 series twins with oval cabin windows is quite hard, as most look very similar, as is the Cessna 340. However, when looking at details the main models can be recognised. The shape of the cockpit and cabin windows is the best way to recognise them from the Beech Queen/King Air and Piper PA-31.
These Cessna 400 series twins have rectangular instead of oval cabin windows, but for the rest they look very similar. Fortunately there are fewer subtypes. The shape of the cockpit and cabin windows is the best way to recognise them from the Beechcraft 65 and Piper PA-31.
Cessna 408 SkyCourier
The Cessna SkyCourier has a nearly square fuselage, that quickly tapers behind the large cargo door on the left side aft of the strut braced wings. On top is a quite tall vertical stabiliser with T-tail. Finally the aircraft has a fixed tricyle landing gear. All in all not difficuly to recognise. (photo Textron Aviation Inc.)