Belo you have a very competitve design. It says "Financial" in a very elegant way.
1) I believe your #11 colors are better than your #15 colors.
2) Take that blue, turn it into the gray equivalent, and make the flight path, plane, and slogan that gray color.
3) I believe we can make the slogan just slightly bigger without losing "largeness" of the main text, let's try that
4) The flight path is definitely too thick in some places for both #11 and #15.
5) I really like the way the plane moves in #11. Can you "cut" the flight path so the "E" returns, without sacrificing your idea? Just create a small hole in the flight path so the E looks like an E once again, but flight path is still there.
I also really like the flight path of #15
i think you have an excellent design