Sources speaking to The Wall Street Journal say that Malaysia Airlines Flight 370 maintained contact with satellites for several hours after disappearing from radar, raising new questions about where the missing 777 wide-body airliner may be. The aircraft had been on a scheduled route from Kuala Lumpur to Beijing before vanishing from air traffic controllers screens just 40 minutes into the flight last Friday. The revelation complicates a mystery that has already confounded investigators and experts for nearly a full week, an eternity by search-and-rescue standards for large aircraft. Flight 370s transponder — the device that delivers flight and altitude information to air traffic controllers — was originally believed to have simply stopped working when the flight was presumed to have crashed in the Gulf of Thailand.