By Jon Hilkevitch, Chicago Tribune Dec. 21--A federal investigation into a rash of close calls involving airliners will begin in January, authorities said Thursday after the latest scare involved a passenger jet flying to Chicago.

CHICAGO _ A federal investigation into a rash of close calls involving airliners will begin in January, authorities said Thursday after the latest scare involved a passenger jet flying to Chicago.

By Jon Hilkevitch, Chicago Tribune Dec. 18--A commuter jet that departed from O'Hare International Airport flew too close to a military transport plane on Sunday because of an error by an air-traffic controller, the Federal Aviation Administration said Monday.

CHICAGO _ Another air-traffic controller error in the Chicago area caused a commuter jet that departed from O'Hare International Airport to fly too close to a military transport plane on Sunday, the Federal Aviation Administration said Monday.

By John Diedrich, Milwaukee Journal Sentinel Nov. 16--The pilots of a Midwest Airlines regional jet made an emergency maneuver over Indiana on Tuesday after a Chicago air traffic controller mistakenly directed the plane too close to another aircraft, officials said Thursday.