jetBlue Airways has invested an undisclosed amount into Joby Aviation, a secretive start-up based in Northern California working on an electric air taxi aircraft. Other investors in the round, valued in total at USD100 million, included Intel and Toyota.

Previously, the start-up had raised USD30 million capital from investors.

Joby Aviation has not disclosed much about its product publicly. Bloomberg, which was allowed exclusive access to the company’s private airfield but was not at liberty to disseminate any photographs or detailed descriptions, revealed that the firm is working on an electric vertical take-off and landing aircraft.

The company had earlier provided illustrations of its aircraft, featuring twelve small rotor engines and four passengers seats, but has since announced it has changed the design, The Verge has reported.

No timeline for further tests or entry into service has been provided.