1) Would have been a great shot, but you should try lightening it up some. Is there vignetting on that also? If so, take it off and repost and see how it is. I think it would look good with the PP you did, but no vignette.
2) I am a sucker to plane shots but the vignette is completely way too much BUT it would work if the crop wasn't co close. The only reason I say that is because of the planes right wing. You did keep it well inside the rule of 1/3s but it bothers me the vignette covers/starts at more than the tip of the wing.
3) Nice shot. I am also a sucker for shots of the flag on it. Did you do any desaturation on this one? The only thing I do not like is the angle. I use CS4 and I don't know if you can do it in LR, but there is a level straightening tool that I would have pulled across the top of the steps - I guess you can't really determine what's straight on that shot becuase of the angle. I actually think a cropped in version would be nice - maybe at the corner of the top step and up to the blue and have the edge of the step and the bottom right of what would be the image.
Thanks for sharing
~Michael~