American Airlines recently reworked their classic logo. Massimo Vignelli, designer of the original, commented on the the original intention of the design.
Legibility, which is a very important element of an airplane. So we used Helvetica, which was brand new at the time. And we wanted to make one word of American Airlines, half red and half blue. What could be more American than that? And there were no other logos then that were two colors of the same word. We took the space away, made one word, and split it again by color. It looked great. The typeface was great. We proceeded by logic, not emotion. Not trends and fashions.