a serious scare in the air at 39,000 feet tonight. a major airline trying to figure out why both engines on an airbus failed. that means there were no engines operating. the incident happened over the weekend. it was a singapore airlines flight. by the way top-ranked airline in the world. that plane was bound for shanghai. there were 194 people on board that plane. it was just south of hong kong when the two engines both lost power. at that point, the plane started to descend. the pilots were rushing desperately to try to restart the engines. so how did this flight lose power to both engines? and could it happen again? renee marsh "outfront." >> reporter: sing more airlines flight 836 with 194 on board was flying over the south china sea bound for shanghai when both engines went out. the sudden loss of power at 39,000 feet as the jetliner