Hi there and welcome to SPS!
I like your work, very nice. Depending on the results you are aiming for, perhaps adding some extra highlighting effects on the upper parts of the planes might add to the 3D effect. When adding the shading, be careful to notice if the shading makes the aircraft look like the correct shape, such as slightly rounded, or more squared.
Also, just noticing the interiors of your planes, quite nice.





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When it comes to shading it looks like you are making a mistake a lot of people make. They draw shading as a one piece affair and it really isnt. One way to make them look better is to draw a large very soft highlight/shadow that extends further up the plane and then near the edge draw a less opaque shadow/highlight which is more tightly feathered. This gives a much better effect IMO 


