Alcoa Inc.'s planned acquisition of RTI International Metals is just the latest in a series of moves by the aluminum manufacturer to boost its burgeoning aerospace business while cutting back on smelting capacity and selling noncore assets. Here's a look at some of Alcoa's other recent moves: Announces it will acquire Firth Rixson, a United Kingdom-based manufacturer of jet-engine components, in a cash and stock deal worth $2.85 billion.