By Eveline Danubrata and Nguyen Phuong Linh KUALA LUMPUR/HO CHI MINH CITY, Vietnam (Reuters) - Malaysian authorities said on Thursday there was no evidence that a jetliner missing for almost six days flew for hours after losing contact with air traffic controllers and continued to transmit technical data. The Wall Street Journal said that U.S. aviation investigators and national security officials believed the Boeing 777 flew for a total of five hours, based on data automatically downloaded and sent to the ground from its Rolls-Royce Trent engines as part of a standard monitoring program. "As far as both Rolls-Royce and Boeing are concerned, those reports are inaccurate. The last (data) transmission from the aircraft was at 01:07 a.m.(local time) which indicated that everything was normal." Boeing and Rolls-Royce have yet to comment.