Archer Aviation could start generating revenue as early as next year.Archer Aviation (ACHR 2.95%) is a California-based start-up that's trying to take the Wright Brothers' radical idea of flight to another level: electric vertical takeoff and landing (eVTOL) aircraft used as air taxis.Estimated by Morgan Stanley to be worth approximately $9 trillion by 2050, the eVTOL market is still in the nascent stages of growth. That kind of forecast makes Archer, which is trading at about$9 a share, seem like a potent ...