As the old saying goes, "If it ain't broke, don't fix it."
Decades ago, Pan Am was toying with the idea of canning the famous globe logo. Thank goodness it never happened and, in fact, the globe just got bigger. Alitalia have kept their tailfin art for decades too.
The latest American Airlines tailfin logo is, in my opinion, easily forgettable. The old winged AA on the other hand was instantly American Airlines. Plain and simple.