Love the direction you're going - fantastic entries and love your icons. I'd like to be sure that the words "AIR" and "INNOVATIONS" carry the same weight/importance within the logo - one is not more important than the other.
Entries #19 and 20 would like to see the text larger in proportion to the icon. Perhaps the size of the word "AIR" in entry #6.
I also really like the type treatment of the word "AIR" in entry #18. Could the word "INNOVATIONS" be the same size and integrate off to the right of the word "AIR"?
On Entry #20, could the icon be incorporated into the word "INNOVATION" instead of the letter "O"? Might also try using the icon from entry #9 in place of the "O" as well.
Also like entry #2 if word "INNOVATION" was same size as "AIR"
I think I have managed the majority of the changes. Some are tougher to make for example #18, if we are to make the word "INNOVATIONS" the same size the icon would disappear entirely. The thing that I came up with was merging the two "NN" in INNOVATION and saving some extra space. Also I have added the element in that design and it turned out nicely.
I have also squeezed some of the other viable requests.