Archer Aviation (ACHR -1.01%) stock closed out the past week of trading with big gains. At the end of Friday's trading, the electric-vertical-takeoff-and-landing (eVTOL) specialist's share price was up 26.5% from the previous week's market close. Even though Archer Aviation and Joby Aviation are competitors, the fledgling eVTOL market is still in its infancy and should be able to support multiple winners. At this stage, Joby's progress actually appears to be a bullish indicator for Archer's outlook. In addi ...