An executive with the European private equity firm that holds a stake in Pilot Flying J signed a registration application for an airplane that has drawn the scrutiny of federal agents.

Pilot, the Knoxville-based chain of truck stops, is facing a government investigation related to allegations of fuel rebate fraud targeting unsophisticated trucking companies. Two employees already have pleaded guilty to fraud charges.

An affidavit released in April included transcripts of secretly recorded conversations, including one in which a Pilot executive allegedly described how the company bought a private plane from Nashville-based Western Express, after that company discovered it had not received the full rebates owed to it by Pilot.

Read more at Knoxnews.com.