Seats, galleys, engines - and those are just the ones who've made the news.
My reference to the engines also involved the RR debacle on the 787s, as well as the troubles experienced by the GEnx, the abandoned attempt by SNECMA to field a new biz jet engine, etc.
As a unrepentant cynicist, my gut feeling is that the industry is short of experienced scientist, engineers and assembly line workers, and too long on MBAs, bean counters and a computer generation accepting, and working with a restrained budget ensuring, that v.1 of anything is always a bit buggy. That might fly if you're producing Angry Birds, but the stakes are rather different when you're building aero engines.