LONDON — As interest in flying cars continues to swell, one of the most prominent start-ups working on the technology has gained a big new backer.

Lilium Aviation, a German company that held a successful test flight of the Eagle, its two-seat electric jet, at its Munich base this year, announced on Tuesday that it has raised $90 million in a new round of financing.

The investment was led by Tencent Holdings, the Chinese internet giant. Other investors in the round included LGT, the investment vehicle of Lichtenstein’s royal family; Atomico, the venture firm run by a founder of Skype, Niklas Zennstrom; and Obvious Ventures, the investment firm co-founded by the Twitter co-founder Evan Williams. Mr. Zennstrom has previously invested in the company.

Lilium is among several companies looking to usher in an era of Jetsons-type flying cars, including those backed by the Google co-founder Larry Page, Uber and Airbus. But the two-year-old company is trying to stand out by focusing on an electric jet — unlike other models that effectively function more like hovercraft.