Hyundai and General Motors announced this week that they are pushing ahead with flying car efforts. Hyundai said that it could have air taxi service available by 2025.
A GM executive said it could take until 2030 for air-taxi services to overcome technical and regulatory hurdles and reach commercialization.
The zero-emissions aircraft, which take off and land like helicopters and carry passengers and cargo, are being developed by a number of startups as well as aircraft makers and automakers.
Hyundai is developing air taxis powered by electric batteries that can transport five to six people from highly congested urban centers to airports.
Other automakers developing flying cars either alone or with startups include Toyota Motor Corp, Daimler AG and China's Geely Automobile Holdings.