This is a piece I did in my spare time. I wanted to take what I learned in my other environments and apply it to this. I never really attempted doing sky traffic before so I wanted to tackle that also. Hope you like.
Nothing too fancy to get that effect. I made new layer on top of everything else and used a airbrush. Duplicated that layer and then used a motion blur on it and that did the trick. There's probably a hundred different ways to go about doing it, I 'll probably try new ways when I do it again in another piece.