U.S., March 20 -- Qatar Airways flight #968 from Doha, Qatar, to Hanoi, Vietnam, declared an emergency when approaching Hanoi on today's scheduled flight. After this, the Boeing 787 Dreamliner went on an erratic flight path.

According to information recorded on Flight Aware, the aircraft turned around, left Vietnam and went back into Thailand air space. The flight did not approach the kingdom's largest airport Bangkok, but landed in Chiang Mai, Thailand.

Looking at flight details on the website, it shows the plane 5 1/2 hours into the flight rapidly dropping from an altitude of 40,000 feet to 10,000 feet and then over the next half hour down to almost ground level while approaching Hanoi, then back up to where it sustained a low level o...