Rocket Lab's launch rate is going up -- and so is its stock price.Small rocket maker Rocket Lab USA (RKLB 3.47%) stock ran up 5% through 2:30 p.m. ET Thursday after KeyBanc announced reservations about aerospace stocks in general -- but named Rocket Lab a notable exception.According to reports, KeyBanc downgraded shares of ATI Inc. and Howmet Aerospace citing "slowing order rates and the onset of inventory accumulation," and expressed skepticism about the outlook for Boeing. In stark contrast, KeyBanc said ...