BARCELONA, Spain — Alef Aeronautics, a flying car firm backed by high-profile venture capitalist Tim Draper, says it has reached 2,850 preorders for its futuristic electric vertical takeoff and landing (eVTOL) vehicle.

Alef Aeronautics, which is based in San Mateo, California, said preorder numbers recently hit a fresh record after previously reporting 2,500 preorders for its two-seater flying car, the Alef Model A.

Customers can access preorders for the Model A online, and to preorder, you have to put down a $150 deposit for the vehicle. Customers can pull the deposit at any time if they want to, so they're not locked in.

Alef is planning to charge customers $300,000 for the Model A when it becomes commercially available — so on 2,850 preorders, that would give it a combined order value of more than $850 million to date.

"As of today we have a little bit more than 2,850 preorders with deposits down, which makes it the bestselling aircraft in history, more than Boeing, Airbus, Joby Aviation and most of the eVTOLs [electric vertical takeoff and landing vehicles] combined," Alef's CEO, Jim Dukhovny, told CNBC.

At a price of $300,000, Alef is asking its prospective customers to part with a lot of cash. Dukhovny insists the higher price tag is needed as Alef is still a startup and isn't making any serious money yet.