BEFORE:
<a href="http://www.flickr.com/photos/dotdoubledot/2399237813/" title="20080402_FlightDay_0887sm by .: sandman, on Flickr"><img src="http://farm3.static.flickr.com/2080/2399237813_d77e309e13.jpg" width="500" height="333" alt="20080402_FlightDay_0887sm" /></a>
AFTER:
<a href="http://www.flickr.com/photos/dotdoubledot/2384726634/" title="Sikorsky UH-60 Blackhawk by .: sandman, on Flickr"><img src="http://farm4.static.flickr.com/3283/2384726634_6473c9db47.jpg" width="500" height="338" alt="Sikorsky UH-60 Blackhawk" /></a>
Nothing but PhotoShop on this one. Adjusted curves for more contrast. I reduced the shadows on the aircaft. Bumped the saturation a bit. Sharpened.
BEFORE:
<a href="http://www.flickr.com/photos/dotdoubledot/2399237871/" title="20080402_FlightDay_0886sm by .: sandman, on Flickr"><img src="http://farm4.static.flickr.com/3260/2399237871_781412f485.jpg" width="500" height="333" alt="20080402_FlightDay_0886sm" /></a>
AFTER:
<a href="http://www.flickr.com/photos/dotdoubledot/2397593522/" title="UH-60 Blackhawk (alternate crop) by .: sandman, on Flickr"><img src="http://farm3.static.flickr.com/2117/2397593522_ae3d565926.jpg" width="500" height="297" alt="UH-60 Blackhawk (alternate crop)" /></a>
This one was tonemapped in PhotoMatix before I edited with PhotoShop.