Shares in the air taxi developer entered Monday down more than 25% this year. Then, the company announced that Boeing agreed to divest three units, including one specializing in military drones, in exchange for an almost 20% stake. The Federal Aviation Administration hasn’t yet certified any eVTOLs for commercial flights, and Archer rival Joby Aviation is further along in the approval process. Joby also has revenue, having reported $38.6 million in the second quarter, up from $24.2 million in the first quarter. The other two units are Wisk Aero, another air taxi developer, and SkyGrid, an air-traffic software developer.