Will give more detailed feedback later but nothing takes my fancy. As i said do not use the word 'flight' to influnce your design. I would even say ignore the words and create me a icon for the number '4' ???
How about this one sir? A image of 4 but there's still an "F" and "Y" to see........ I will to know my luck with this one....... hehehe I wish you like it. Rice a student and logo artist. KEEP IT SIMPLE!!!