If all goes according to plan, the Slovak company wants to sell its flying cars by 2020.

FLYING cars might seem like the stuff of science fiction, but two prototypes were launched Thursday on the French Riviera, at an event showcasing “supercars” in Monaco.

Dutch and Slovak companies unveiled their designs as world premieres in the tiny well-heeled principality, where luxury automakers have gathered until Sunday for the Top Marques showcase event.

Bratislava-based Aeromobil, whose first prototype presented two years ago suffered an accident, is back with a “new generation” of flying vehicle named after the firm which makes it.

“We are taking reservations from today for deliveries expected in 2020, after the process of (regulatory) approvals is completed,” the Slovak firm’s spokesman Stefan Vadocz said.

The Aeromobil, a flying supercar is on display as part of the "Top Marques" show, dedicated to exclusive luxury goods, on April 20, 2017 in Monaco. Picture: Valery HacheSource:AFP

The Aeromobil vehicle, six metres long and with a fully-deployed span of nine metres, is a normal four-wheel car which can unfold its wings to transform itself into a plane able to fly two passengers at a cruising speed of 260km/h for up to 750 kilometres.

The price? Between 1.2 and 1.5 million euros ($A1.7 to $A2.13), depending on options chosen. Its Dutch rival for the futuristic vehicle type, the Pal-V Liberty, is the brainchild of Robert Dingemanse, whose company is based near Breda in the south of the Netherlands.

The Aeromobil, a flying supercar is on display. Picture: Valery HacheSource:AFP

Inside the futuristic Aeromobil flying car.Source:Supplied

His crossover car-plane is more compact, at four metres long, and should be deliverable as early as next year, once official approvals are secured. He is already taking orders for a vehicle which will cost between 299,000 and 499,000 euros.

The Dutch flying car is in fact a gyrocopter with three wheels and a retractable rotor. It can carry two people at a cruising speed of 160km/h for between 400-500 kilometres.

It is “one of the safest flying machines on the planet,” able to fly “whatever the weather conditions,” say its designers.

Users of the Aeromobil and the Pal-V Liberty will require both a driving licence and a pilot’s qualification.