So I was at LAX yesterday and we went right behind a 744 (actually, two of them. One Air China and one KL) when I noticed that the fairing over the APU looks radically different from the rest of the body panels. The APU fairing is made up of myriad small panels, many of them probably not much more than a foot on a side.
Anyone know why? I don't think this is the case on the 777.