Adam Goldstein (R) and Brett Adcock, co-founders and co-CEOs of flying taxi company Archer Aviation, pose for a picture as they rehearse for the unveiling of their all-electric aircraft from a facility in Hawthorne, California, U.S. June 8, 2021. Archer Aviation unveiled its first electric flying taxi "Maker" in a Tesla-style debut on Thursday as an increasing number of investors and aviation companies pile into the hot but yet-to-be-approved urban air mobility space. REUTERS/Mike Blake

Adam Goldstein (R) and Brett Adcock, co-founders and co-CEOs of flying taxi company Archer Aviation, pose for a picture as they rehearse for the unveiling of their all-electric aircraft from a facility in Hawthorne, California, U.S. June 8, 2021. Interest in zero-emission aircraft that take off and land like helicopters but fly like planes is growing as aerospace companies look for new markets and face pressure to help decarbonize their industry though the battery-operated vehicles. REUTERS/Mike Blake

Adam Goldstein (R) and Brett Adcock, co-founders and co-CEOs of flying taxi company Archer Aviation, pose for a picture as they rehearse for the unveiling of their all-electric aircraft from a facility in Hawthorne, California, U.S. June 8, 2021. Archer expects Maker's commercial launch in 2024 in Los Angeles and Miami and is in the process of certifying the piloted four-passenger aircraft with the Federal Aviation Administration, co-founder and co-CEO Brett Adcock told Reuters. REUTERS/Mike Blake

Flying taxi company Archer Aviation prepare for the debut of their all-electric aircraft from a facility in Hawthorne, California, U.S. June 8, 2021. REUTERS/Mike Blake

Adam Goldstein (R) and Brett Adcock, co-founders and co-CEOs of flying taxi company Archer Aviation, step out of their invention as they rehearse for the unveiling of their all-electric aircraft from a facility in Hawthorne, California, U.S. June 8, 2021. REUTERS/Mike Blake

Brett Adcock (L) one of the co-founders and co-CEOs of flying taxi company Archer Aviation, talks with production people as they prepare the unveiling of their all-electric aircraft from a facility in Hawthorne, California, U.S. June 8, 2021. REUTERS/Mike Blake