I love it too!
I'm assuming the F-14 is a more recent addition, because compared to all of the other planes(f-15, mig-31) it's really not very fun to fly. It rolls much slower than all of the others and doesn't enjoy doing negative Gs and it's speed (I think) is a little less than the mig-31(which is better in a turn-fight).
I'm really nitpicking at this point, but I feel the missile launch sound should be somewhat more urgent sounding and the camera movement with my analogue stick does not feel as some as the ace combat games.
I'm surprised this game flew under my radar for so long! I'm really liking it so far! Are there any plans for some sort of kickstarter or something?