Chapter 17 — Between Two Runways

The aviation meteorological bulletin updated at 13:30 completely changed from the morning forecast: a strong convection zone was forming unusually quickly west of the Vinh Ky range, moving east at a speed that caused even the station's meteorological department to update the forecast model twice within an hour.

Boi Thu read the news on the secondary screen and compared it with the satellite image of clouds he had just downloaded. There was a dense mass of cumulus clouds with unusually high cloud tops, exactly the type that signaled strong thunderstorms with gusts that could far exceed the normal level of the area.

She recalled lessons in aviation meteorology from her time as a student: this rapidly rising mass of cumulus clouds was often accompanied by a strong downdraft in front of the system, creating a sudden change in wind gusts right in the final approach zone — exactly the type of phenomenon that contributed to the accident eight years ago at Bach Lung, although the scale and speed of formation this time was much more violent than that night. That familiar feeling made her hand pause for a second on the keyboard, but she took a breath, letting consciousness overwhelm her memory, focusing on what was actually present on the screen in front of her.

"This is not a normal afternoon storm," she told Van, who had just joined her shift today due to overlapping shift schedules. "The formation speed is twice as fast as the original model predicted."

"The southern gateway airport has just announced a temporary closure because of lightning directly on the runway," Van said, eyes still glued to the communication screen, where aviation announcements were constantly updating. "Two flights are on their way there and have to find alternate airports."

Boi Thu called the airport fire and rescue department and informed the situation to Ung Thuc Lam, the captain in charge, who had been in Tra Son even longer than she.

"We are ready to go into full combat mode," Lam said over the phone, his voice firm, undeterred by the bad news. "Fire trucks and ambulances were all periodically inspected last week, have enough fuel, and enough manpower on duty today. Just focus on air coordination, let us take care of the ground part."

"Thank you," Boi Thu said, feeling a small part of the burden being shared knowing the ground team was ready. "I will update continuously if there is a change in quantity or urgency."

"So be it. We're used to waiting at the ready." Lam hung up, leaving Boi Thu with a fragile sense of reassurance that at least, if the worst happened, there were people fully prepared to respond.

"Is Tra Son on their list of reserve airports?"

"Yes. One of the three closest options." Van turned to look at her, his eyes immediately understanding what that meant. "If both of those flights choose Tra Son, combined with our regular flight schedule this afternoon, we will have more traffic than usual just when the weather is deteriorating."

Boi Thu immediately called Chuong Ba Vong and reported the situation. He arrived at the radar room less than five minutes later, carrying a notepad and the serious expression of someone accustomed to assessing risks in a split second.

"I called Khoat for support," Vong said. "Even Bach is on his way, even though it's not his brother today. We need as much manpower as we can mobilize."

"How's the radar?" Boi Thu asked, a question she couldn't help but ask in this situation.

"Checked this morning according to the routine maintenance schedule, there were no unusual signs," Vong said. "But you know better than anyone, this device holds no promise in extreme weather conditions."

Fourteen hours, the official announcement confirmed: two commercial flights from the southern gateway airport chose Tra Son as the reserve airport, expected to arrive within forty-five minutes. At the same time, three regularly scheduled flights of Tra Son itself were also on their way, not to mention a helicopter transporting goods to meteorological stations on the mountain that was asking for permission to make an emergency landing before wind gusts exceeded the safety limit for this type of aircraft.

Six targets, within forty-five minutes, at an airport that typically only handles an average of three to four flights per hour during peak hours.

"This will be the busiest shift since I've worked here," Van said, unable to hide the tension in her voice, even though she had fourteen years of experience.

"We'll handle it," Boi Thu said, her voice, though internal, also filled with a familiar feeling that she recognized immediately—not paralyzing fear, but heightened alertness, a feeling she had learned to distinguish clearly from panic over the past weeks. "Let's prioritize now, before everything rushes in at once."

She opened the regional airspace map on the secondary screen and began to outline a plan: two diversions from the south would be given priority because of limited fuel after flying additional unplanned distances; Three regularly scheduled flights will have staggered approach times, one flight may have to hold in the eastern safety area if necessary; Cargo helicopters, because they are more sensitive to wind gusts than fixed-wing aircraft, will be given priority to land as soon as possible, before the storm gets closer.

She calculated a safe waiting area far away from the developing convection zone, high enough to avoid the strongest turbulence but still within the radio's stable communication range. Ten years of experience gave her an almost instinctive sense of spacing the flight paths so that no one had to wait so long that fuel became a problem, but also that no one was forced to approach too quickly in weather that was deteriorating by the minute.

"What if the storm comes earlier than expected before all six flights have finished landing?" Bach asked, his voice a bit worried but no longer shaking like before.

"We have a backup plan," Boi Thu said, not taking his eyes off the screen. "If the wind gusts exceed the safe limit for landing, flights that are not yet in the final approach phase will be transferred to hold flights or find another alternate airport further away. The absolute priority is not to force anyone to land in conditions that exceed the aircraft's technical limits, even if that means some flights have to fly longer distances."

Khoo walked into the room, said nothing, immediately sat in the second support position, his eyes quickly scanned the screen to grasp the situation. A few minutes later, Bach also arrived, breathing heavily because he had just run in from the parking lot, and sat down in his familiar observation position.

"How are the tasks assigned, Ms. Thu?" asked sharply, his voice had completely changed to work mode, there was no longer a trace of an evaluating supervisor, but of a real colleague ready to share the burden.

"I keep the main flow, overall coordination," Boi Thu said, his voice quick but clear. "Mr. Khoat is in charge of liaising with the two diversion flights, ensuring they receive enough information about the runway and weather conditions before entering the approach area. Van maintains contact with the three regular scheduled flights, ready to give standby orders if necessary. Bach, you closely monitor the cargo helicopter and continuously update wind gust data for all of us."

The three people nodded, no one asked more questions, because her orders were clear, specific, exactly what each person needed to know to begin taking action immediately.

Outside the glass window of the command tower, the western sky was turning dark gray, distant lightning flashed behind the thick layer of clouds, and the first thunder, even though it was dozens of kilometers away, had begun to echo, a low sound signaling that what was to come would not be simple.

Vong stood behind, not interfering with direct operations, but his presence brought a sense of stability to the whole room, like a captain standing behind the auxiliary rudder, ready to assist if needed but trusting completely in the person at the helm.

"I'll call the Regional Aviation Administration about the situation, in case I need to assist with inter-airport coordination," he said, then walked out of the room, leaving the remaining four people to focus entirely on the screen in front of them.

Outside, a second clap of thunder sounded, a little closer than the first, and for that brief moment, the entire radar room seemed to hold its breath at the same time, waiting for what was to come in the next forty-five minutes.

"Let's get started," Boi Thu said, his hand on the microphone, his eyes glued to the radar screen where six bright dots were slowly moving closer to the center of the screen, each dot carrying its own story, its own level of urgency, and all waiting for the decision of the person sitting in the center of this room.