SANTA CLARA, CA—Stellantis is investing an additional $55 million in Archer Aviation Inc. The start-up plans to build battery-powered air taxis at a new factory in Covington, GA.

Developing lightweight, yet powerful air taxi batteries is a big challenge.

SAN JOSE, CA—Archer Aviation Inc. has opened a high-volume battery pack manufacturing line here.

WESSLING, Germany—Lilium has started to install state-of-the-art production equipment to assemble the propulsion units of its electric vertical take-off and landing aircraft.

MUNICH—Lilium N.V. has started to assemble its much-anticipated electric vertical take-off and landing (eVTOL) aircraft at its factory in Wessling, Germany.

DAYTON, OH—Joby Aviation Inc. plans to build a $500 million factory here to produce electric vertical take-off and landing (eVTOL) aircraft.

GKN Aerospace Services Ltd. is partnering with Lilium N.V., which is developing an electric vertical take-off and landing (eVTOL) jet for air taxi applications.