Jetliner evacuated by emergency chute in Chicago CHICAGO -- Officials of American Airlines say no passengers were seriously injured when the pilot of a flight from Washington, D.C. ordered the plane evacuated after landing at Chicago's O'Hare International Airport. American Airlines Flight 4309 was operating as an American Eagle flight when it landed safely Monday. Airline officials say the pilot made the decision to evacuate the Embraer 175 aircraft due to an instrument warning of a possible issue. The passengers left the plane via chutes. The airline said 57 passengers and four crew members were aboard the flight. A passenger tells CBS Chicago station WBBM-TV the travelers were about to deplane at the gate when they heard someone urgently say, "Evacuate!" Many of them had no coats as they went down the chutes, and the bitter cold became an issue. American told WBBM the pilot decided to empty the plane "out of an abundance of caution."