As noted above, the new livery came about because most of the surface is no longer aluminum.
I personally don't like it at all. It lacks a timeless quality that will doom it to being changed in the next decade, no doubt. Helvetica is still a classic font. I think running the copy over the windows is strange looking.
The previous identity had a good run though. 1967.
Even that one was a bit of a mash up. Massimo Vignelli who created the 1967 AA, and was a teacher of mine, proposed to drop the eagle from the logo. Mass dispute arose, supposedly the pilots threatened to strike, and the previous designer, Loewy, added in the stylized eagle between the A's.
I always thought that the excuse for the bare metal to save weight was hooey. I think the Air Force adopted it in order to simplify things and because airfield attacks became non-existent.
But if you ever looked at an AA DC-10, the thing was so big, and sourced from so many plants, that the paneling never was a consistent color.
It'll be interesting to see how AA handles licensing it's use for hobbies. my guess is that they'll be pretty fierce about it.