The electric air taxi specialist is moving steadily toward liftoff, but after its massive stock rally over the past year, is it still worth buying?

Archer Aviation ( ACHR 1.39% ) just completed the longest test flight yet of its Midnight aircraft, covering 55 miles at speeds of more than 125 miles per hour. The flight took just 31 minutes to complete. That's more than enough distance and speed to make Midnight an attractive travel option for those living in congested cities.

And that, in turn, could make the company's stock a smart investment for aggressive, long-term investors. Here's what you need to know.

Archer Aviation's big goal

Archer Aviation is, basically, attempting to use new technology to break into the competitive and well-developed aerospace industry . The Midnig

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