article_snippet: Air traffic controllers in Malaysia radioed the crew to contact controllers in Ho Chi Minh City for controllers in Ho Chi Minh City onward journey through Vietnamese airspace.
article_snippet: "  Minutes later, controllers in Ho Chi Minh City disappeared from radar.
article_snippet: Malaysian authorities revealed days later that military radar had tracked controllers in Ho Chi Minh City as controllers in Ho Chi Minh City turned back to the west, flew across the Malay Peninsula, and up the Strait of Malacca, before flying out of radar range and vanishing once again.