Archer Aviation (ACHR) shares closed nearly 20% higher on Monday following speculation of a potential partnership with Tesla (TSLA). The investor excitement appears to have been triggered by a social media video featuring ACHR’s electric vertical takeoff and landing (eVTOL) aircraft alongside TSLA products. More News from Barchart Separately, the automaker also posted a cryptic video today, hinting at an Oct. 7 announcement. Following today’s rally, Archer Aviation stock is up more than 150% versus its ...