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Chris Caputo stood on the tarmac at Burlington International Airport in Vermont in early October and looked to the clouds in the distance. He had piloted military and commercial aircraft over a long career, racking up thousands of flight hours, but the trip he was about to take would be very different.

That’s because the airplane Mr. Caputo would fly runs on batteries. Over the next 16 days, he and his colleagues flew the plane, a CX300 built by their employer, Beta Technologies, down the East Coast. They would make nearly two dozen stops to rest and recharge, flying through congested airspace over Boston, New York, Washington and other cities.