A former United Airlines flight attendant who made phony bomb threats against jetliners has been sentenced to 18 months in federal prison.

Patrick Cau, who also uses the name Patrick Kaiser, was sentenced Monday by a federal judge in Los Angeles.

Cau pleaded guilty earlier this year to one count of false information and hoaxes. In the plea agreement, Cau said he used pay phones in several cities to make eight threats against United flights between October 2012 and January.

The German national who now lives in Dallas was also ordered to pay more than $300,000 to United and to Los Angeles police as restitution because flights were delayed, canceled, evacuated or searched.

(AP)