A discovery of a miniature liquor bottle on Southwest Airlines Flight 2543 about 1:15 p.m. Monday caused a pilot to decide to take his Southwest Airlines Boeing 737 back to the gate at Chicago Midway International Airport. Passengers were evacuated and rescreened, and the jetliner searched with nothing else suspicious found. The plane then proceeded for takeoff.
Wikipedia: Chicago Midway International Airport | Southwest Airlines
SOURCE: Chicago Breaking News Mini liquor bottle causes evacuation of plane at Midway