3 October 2013
United Express flight UA-3578/S5-3578 ,operated by Shuttle Airlines Embaer ERJ-170 , from Denver to Toronto it was climbing through FL290 when the crew received a landing gear indication.The crew stopped the climb and requested to descend to FL110 and decided to divert to Chicago O Hare International airport.Airplane continued at FL110 for about 1 hour until to reach Chicago airport that after some circling airplane landed safely on runway 28.
Chicago international airport
http://flightaware.com/live/flight/TCF3578/history/20131003/1602Z/KDEN/CYYZ