5 September 2013
Southwest Flight WN-48 , Boeing 737-300 from Houston Hobby airport to Dallas took off from Hobby airport and was climbing at 3700 feet when the crew received a cargo door open indication.The crew advised the tower and diverted back to Houston for a safe landing.After checks they found that cargo door it was opened.
Houston Hobby airport
http://flightaware.com/live/flight/SWA48/history/20130905/2300Z/KHOU/KDAL