More than two years after an emergency landing in Kansas led local authorities to discover cannabis-infused chocolate bars on his single-engine airplane, Utah resident Jeff Siegel’s challenge to the revocation of his pilot’s license sputtered Tuesday in a federal appeals court.

A three-judge panel of the U.S. Court of Appeals for the D.C. Circuit upheld a federal agency’s decision to revoke Siegel’s private pilot certificate. The unanimous panel, led by Judge David Sentelle, broadly rejected Siegel’s claim that regulators, including the National Transportation Safety Board, had failed to consider several “mitigating factors,” including the fact that the cannabis chocolate bars had been purchased in Colorado, one of several states that permit recreational marijuana use.