Former officer who dragged passenger from seat to sue airline and city of Chicago

CHICAGO, Illinois (KTRK) -- The Chicago aviation officer who was fired for dragging a passenger off a United Airlines flight is now suing the airline and the city.

Former officer James Long says he wasn't properly trained to deal with misbehaving passengers, and therefore shouldn't have been fired.

RELATED: A moment-by-moment timeline of United incident

Long was terminated after the notorious dragging incident last spring, when Doctor David Dao was forcibly removed from his seat on a United flight at O'hare Airport.

RAW VIDEO: UNITED PASSENGER DRAGGED OFF FLIGHT AT O'HARE

A Facebook video appears to show a passenger being forcibly removed from a United Airlines flight Sunday evening at O'Hare International Airport.

Long is suing United Airlines and the city of Chicago for more than $150,000.

WATCH: UNITED CEO SENDS EMAIL TO EMPLOYEES

The CEO of United Airlines sent an email to employees after a passenger was dragged off an airplane at O'Hare.