United Airlines believes you may someday take a small electric aircraft to get to the airport.

The airline is joining other investors backing Archer, a start-up developing electric vertical takeoff and landing aircraft. If Archer can get its eVTOL certified by the Federal Aviation Administration, it expects to deliver the first aircraft in 2024.

"It's pretty incredible to think how big this market can be," Archer co-founder and co-CEO Adam Goldstein said. "The partnership with United really gives us a chance to get to market first and really helps us accelerate our timeline."

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