DETROIT — Hyundai and General Motors said on Monday they are pushing ahead with developing "flying cars," with the South Korean company expressing optimism it could have an air-taxi service in operation as soon as 2025.

A GM executive said it could take until 2030 for air-taxi services to overcome technical and regulatory hurdles and reach commercialization.

Electric vertical takeoff and landing (eVTOL) 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, but they face a long road to profitability.

Hyundai is ahead of its previously stated timetable for rolling out air-mobility vehicles, Jose Munoz, the company's global chief operating officer, said in an interview broadcast on Monday at the Reuters Events Car of the Future conference.

Munoz, who is also CEO of Hyundai North America, previously said urban air taxis would be in operation at major U.S. airports by 2028 and perhaps earlier. He told Reuters on Monday it could possibly happen before 2025.

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