You might think it’s science fiction but electric vertical take-off and landing (eVTOL) aircrafts are seeking to be approved by air-safety regulators.

Both Airbus and Boeing are developing ideas for eVTOL, with Boeing investing $450m in Wisk Aero which is working on an autonomous version.

Here are some of the other firms you may have not hear of.

Joby Aviation‘s air taxi hopes to become the first to obtain the certification from the America’s Federal Aviation Administration (FAA) in 2023. It seats four passengers and a pilot, and counts Uber as one of its investors.

Archer Aviation, is planning to start in 2024 with a commercial ride-sharing service. United Airlines is backing it.

AutoFlight is seeking approval for its Prosperity I air taxi. It can take off and land like a helicopter, but is cheaper and greener. With a range of approximately 250km, the four seater (which includes one pilot) is intended to transport passenger across large cities.

The eh216, manufactured by EHang, has been tested in more than 20,000 trial flights. It has a range of 35km, seats two passengers and its autonomous.

Volocopter is testing both crewed and autonomous eVTOLs. It is aiming to provide air-taxi services in Paris for the 2024 Olympic games.

Lilium is working on an all-electric seven-seater.