MADISON — Dave Kettner, the president of Madison-based Virent Inc., doesn’t make a habit of hanging out with international celebrities, but he did so last fall on a transatlantic flight with billionaire Sir Richard Branson.
It helped that Kettner’s firm supplied much of the sustainable aviation fuel that entirely powered Virgin Atlantic’s “Flight 100” in November 2023, the first such transatlantic crossing by a commercial airline.
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