Sweet! I do prefer the color, although the sepia does look sort of "vintage"! Horizon is off a good bit , straightening it would help. One thing that would have increased the background separation would be a wider aperture... to soften the background a bit.
I played with it.. (hope you don't mind). I lightly desaturated the background, and did a light Gaussian blur on it... (hopefully not so much that it looks bad) to make the plane pop a little more.
No problem at all. Your edit looks great. I am new to DSLR's (only a few months) so still getting used to both taking and editing photos. The snap was taken having just been taking photos on the opposite direction of high flying planes but the camera was setting to shutter priority so the aperture took care of itself (luckily or it would have been awful otherwise!).