On July 29, 2016, suspected China-linked hackers breached information systems at Vietnam’s Tan Son Nhat and Noi Bai international airports amid escalating tensions over competing South China Sea claims. Vietnam’s Civil Aviation Administration said the attacks began at 13:46, disrupting check-in systems used by Vietnam Airlines and VietJet. At 16:07, attackers took over flight-information displays at Noi Bai, showing political messages criticizing Vietnam and the Philippines, and briefly seized the airport’s public-address system to broadcast a distorted English-language message about Vietnam’s territorial claims.
The disruption forced airports to switch to manual check-in procedures. More than 60 flights at Tan Son Nhat and 30 at Noi Bai were delayed by between 15 minutes and more than an hour, affecting approximately 2,000 passengers. Around 16:00, Vietnam Airlines’ website was defaced and its customer database was reportedly stolen and published online; the airline advised members to change their passwords after service was restored at 18:30. The attackers claimed affiliation with the Chinese group 1937CN, but public reporting described the attribution as suspected rather than conclusively established. Airport screens and public-address systems remained impaired the following day, while related Vietnamese websites, including those of the Vietnam Football Federation and National Economics University, were also compromised.