Completely electric flying taxis called eVTOLs (for electric vertical take-off and landing) could be in use in the United States by 2026. United Airlines has already advance purchased 200 of them to air-taxi folks above LA traffic to the airport and has also investigated a significant amount of money for developing the technology that flies them.
Depending on your perspective, the air taxis look like large drones, or small helicopters. They will be piloted on rollout but pilot-free flying is under consideration for future operations. eVTOL technology is being developed by Brazilian company Eve Air Mobility.