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The DC-6 fits between the smaller DC-4 and bigger DC-7, and look most like the latter. It also has rectangular cabin windows. However, the oil coolers on top of the engines are much shorter. They disappear in the nacelles near the wing's leading edge.
The DC-7 is the biggest of the three four engined Douglas transport aircraft with a single vertical fin. It has the rectangular cabin windows of the DC-6 and the long oil coolers on top of the engines of the DC-4. Also the vertical stabiliser is taller.
The Douglas DC-8 is most likely confused with the Boeing 707 or the Convair 880/990, as these are also four-jet narrow-body aricraft with engines under the wings. Most typical for the DC-8 are the two air intakes at the bottom of the nose. Also the DC-8 has one large eyebrown cockpit window on each side (Boeing 707 two small ones, the Convairs none) and has no forward pointing antenna at the top of the vertical stabiliser.
Douglas F3D/F-10 Skyknight
Unlike other contemporary fighters the Douglas Skyknight has straight wings and a wide fuselage so that the crew can sit side-by-side. The engines are in pods below/at the side of the fuselage, below the wings.
Douglas F4D/F-6 Skyray
This carrier based fighter is especially recognised by the triangular air intakes in the wing roots, A-4-like canopy and rounded tips of delta wings and vertical stabiliser.
This dive bomber is characterised by perforated split flaps at the trailing edge of the inner wings, a trapezium vertical stabiliser with rounded top, multi-framed canopy with rear gunner in open air. Also the rear fuselage tapers up after the wings. The retractable main gear has no gear doors.
Douglas X-3 Stiletto
This sleek research aircraft has small trapezoidal wings (like on the F-104). The nose is very long and pointed. The two engines have tilted, semi circular air intakes at the side of the fuselage, and exhausts below the rear fuselage.
The Eclipse 400 is similar in appearance as the Cirrus Vision Jet. The engine nacelle has a round intake and is placed on a pylon. Furthermore it has one cabin window and one cockpit side window, and no ventral fins. (photo: D. Miller/WikiMedia)
The Eclipse 500 and derivatives are the smallest aircraft on this category. Note the comparatively small engines, small tip tanks and wingshaped fuselage.
El Gavilán EL-1
This single piston powered utility aircraft developed in Colombia looks similar to the GippsAero GA-8 Airvan and Explorer 350R, but more "box like". It can best be recognised by its vertical tail: the trailing edge is a bit swept forward.