A Maryland man who operated a private jet charter company has been found guilty of defrauding customers out of $15 million, the U.S. Department of Justice announced.

Patrick Britton-Harr, 43, was convicted of falsely promising clients that their payments would be used to secure aircraft in exchange for discounted private jet flight hours.

Prosecutors said Britton-Harr misled customers through his company by offering reduced-cost access to private aviation while allegedly misusing the funds provided by clients.

The conviction follows an investigation into the company’s operations and its handling of customer payments.