Right, I'm assuming the aliens be chasing the slower of the two attacking planes, since they don't have their performance-capbalities memorized yet.

So they're likely falling back on "Faster plane = better thrust-ratio = more manuverable" like the BS-propoganda that happened when Americans first encountered rocket/jet fighters.

So obviously, mah MiG-23 is a brick to them... [i]fun surprise-time for them.[/i]

I'm also assuming our intel from AWACS only told us of what they could see. Tight formations or passive groups could easily increase the amount of opposition we're facing.

Oh, and as usual, chances are the aliens got some sort of ECM, not sure how effective it'll be, but I'm figuring some missiles ain't gonna hit.
-But I'm hoping they're experiance brown-trouser levels of pucker-factor