Toyota, an existing Joby partner, apparently likes the progress Joby is making. The automaker has agreed to invest an additional $500 million through the purchase of two equal tranches of Joby stock, with the first expected to close later this year and the second in 2025.

Shares of Joby Aviation (NYSE:JOBY) were launched more than 20% higher in Wednesday’s premarket trading thanks to another $500M investment by Japanese carmaker Toyota Motor Corp (NYSE:TM). The investment will enable Joby (JOBY) to expand its commercialization of an electric air taxi and bring Toyota’s (TM) total investment in Joby (JOBY) to $894M.

Joby Aviation raised $500 million from Toyota, the largest single round of funding for a flying taxi startup in years.