What´s so difficult in creating a company logo? The ingame system makes it a very easy process even for untalented designers like me.Try it out ! If you are part of an alliance you seem to play this game seriously to some extent, so at least creating a company with a doorbell sign shows some commitment to your company. If you insist to show the flag of your alliance, you should show one of your own.
Creating an airplane livery is some other ballpark and stays a task for the talented masters of paint programs.
And just talking about "appearance" and "image" I would like to place a wish for more carefully and respectfully chosen airline names.Very often they are uninspired, show typos, use real life names or only slightly changed name parts of those to stay out the forbidden zone. Taste is something you hardly can discuss, so a neutral name should be your choice instead of a "funny" or "provocative" variant.
Would you consider buying tickets of a "Rusty old Crap Airline" or "Lame Duck" in real life ? I wouldn´t, and frankly, I´m getting tired of that special lame infant kind of humor repeating itself in every game world.