McQueen vs. Von Richthofen. Hands down, one of the best dogfights ever.
I know it's not totally human vs. alien, but Sheridan/Kosh vs. Ulkesh.
+1 on the Aliens fight scene too.
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" And any man who may be asked in this century what he did to make his life worthwhile, I think can respond with a good deal of pride and satisfaction: 'I served in the United States Navy.'"- John F. Kennedy
"NUKE-ular. It's pronounced NUKE-ular."- Homer Simpson
"You should never underestimate the predictability of stupidity."- Bullet Tooth Tony
Run, jump, lift, puke, repeat.