Boeing, the world's largest aircraft manufacturer, has fired its chief financial officer and another executive for unethical conduct.

The dismissals follow allegations that a former top Pentagon procurement official gave Boeing information about a rival bid in a controversial multi-billion dollar deal for new air-to-air refueling planes.

Boeing says CFO Michael Sears was improperly negotiating a job with former Air Force procurement official Darleen Druyun while she was still supervising government business with contractors.

A short time later, she started working for Boeing.

This newest incident follows an industrial espionage scandal earlier this year that cost Boeing $1 billion in satellite launch contracts from the U.S. Air Force.