When will autonomous flying vehicles be commercially available?

A number of companies are developing cars that fly themselves. Many of these ventures are eyeing 2021-2022 for commercial flying car/taxi operations in the United States.

Two previous binary questions (for 2017 and 2021) have asked when flying cars will (if ever) arrive for commercial use. So far, they've received only negative verdicts. This question asks the Metaculus community to put a date on it.