The Civil Aviation Authority of Vietnam (CAAV) instructed all aviation units to implement tropical storm response procedures to ensure flight safety and minimise disruption.
CAAV said Van Don International Airport and Cat Bi International Airport were forecast to be directly affected by the storm, while Noi Bai International Airport and Tho Xuan Airport were told to closely monitor weather conditions in case the storm changes course.
Van Don and other affected airports operated by the Airports Corporation of Vietnam (ACV) were instructed to inspect runways, infrastructure and communications systems to identify and address any damage that could affect flight operations.
The authority also warned of heavy rain after the storm makes landfall and ordered affected airports to maintain 24-hour duty rosters and closely monitor weather updates to adjust operations when necessary.
The Vietnam Air Traffic Management Corporation (VATM) was instructed to ensure the timely provision of meteorological information and weather warnings, while airlines were told to closely monitor the storm and adjust flight schedules if required.
CAAV also directed the Northern Airports Authority to oversee storm preparedness at affected airports and maintain coordination with relevant agencies.
At 9 pm on Thursday, the storm's centre was located over waters west of China's Hainan Island, about 240 km from Bach Long Vi Island off Haiphong and 340 km southeast of Mong Cai in Quang Ninh, with sustained winds of Category 8-9 and gusts of up to Category 11.
The National Centre for Hydro-Meteorological Forecasting said the storm was most likely to continue moving north-northwest before making landfall in Quang Ninh on Saturday night and then weakening as it moved into China's Guangxi region.