This eVTOL start-up is making progress toward commercialization.The futuristic allure of an electric vertical takeoff and landing (eVTOL) taxi service appears closer than ever to reality. Archer Aviation (ACHR -1.53%) has announced that it's received the "Part 135 Air Carrier & Operator certificate" from the U.S. Federal Aviation Administration (FAA), allowing it to begin commercial operations.Don't grab your carry-on just yet, as Archer's "Midnight" eVTOL aircraft is still awaiting a separate certification ...