Chapter 4 — Between Two Runways

Eight years ago, Bach Lung air traffic control tower did not have a separate room for interns, only an extra chair close to the wall, enough for Boi Thu - then twenty-six years old, who had only completed the theory course three months ago - to sit and observe his instructor's night shift without touching any equipment.

The rain poured down on the corrugated iron roof above the radar room from nine o'clock in the evening, not heavily, but steadily, accompanied by a layer of low clouds that covered the valley where Bach Lung airport was located between two mountain ranges. Doan Khac Thuyen sat in the main position, his voice was deep and firm, the voice that made Boi Thu believe that if he just listened, everything would be okay.

"Two flights at the same time tonight," he told her at the shift change, without turning around, his eyes still glued to the screen. "A shipment is asking to land earlier than scheduled to avoid the southern low pressure area, a night flight training flight of the flight school, students are flying the final approach lesson."

The training flight was called Echo Tam Mot, a small twin-engine plane with only two people on board: the flight instructor in the right seat, and a twenty-two-year-old student named Kha Nhat Vien in the left seat, taking the last mandatory night flight before qualifying for the commercial license exam.

Boi Thu had met Nhat Vien twice before, in the pilot lounge of the airport, where she sometimes stopped by to pick up meteorological documents. He had a habit of tapping his fingers on the table to the beat of a certain song that only he could hear, and once asked her, half-jokingly, if being an air traffic controller ever regretted not being able to fly the plane himself. She replied that she preferred to be in a position to see the whole picture rather than just seeing part of the sky through the cockpit window. He laughed and said she talked like someone much older than her age.

Thuyen was the one who accepted her into the internship program at Bach Lung, who patiently explained each separation rule until she could recite it by heart without looking at the documents. To her at that time, he was not just a guide, but the model of an ideal controller: absolutely calm, never showing any signs of panic, even during the most stressful shifts. That absolute trust, she later understood, was also what kept her silent that night.

"Echo Tam Mot, Bach Lung Dai, continue to descend fifteen hundred feet, prepare to approach the end of runway thirty-five."

"Lower one thousand five hundred, prepare for approach, Echo Eighty One," the young voice replied, with the noticeable tension of someone who had just flown at night for the first time in less than perfect weather.

On Bach Lung's old radar screen — older than the one Boi Thu would later sit in front of at Tra Son — Echo Tam Mot's light dot moved slowly, evenly, almost perfectly on its theoretical approach. But Boi Thu, sitting in the passenger seat, noticed something: the distance between the position updates of that light dot was gradually deviating from the center line, a small deviation, only a few hundred meters, maybe just signal interference, maybe the wind.

At the same time, the shipment was asking for permission to urgently change direction because the storm clouds to the south were closer than forecast, and Thuyen was busy answering, his voice faster than usual, his hands typing continuously on the keyboard to update the new flight plan.

Boi Thu looked at Echo Tam Mot's dot of light a little more. She opened her mouth, about to speak.

Then she looked at Thuyen — the man with twenty-two years of experience, the man she admired so much that sometimes she felt her own judgment was too immature to speak up while he was dealing with another situation — and she thought, it's just the wind, he must have seen, he always saw everything before it happens.

She said nothing.

Thirty seconds later, the radio picked up the voice of the teacher flying over Echo Eighty One, no longer calm and professional but urgent, almost shouting over the sound of the engine: "Bach Lung, Echo Eighty, we suddenly lost altitude, strong winds, trying..."

The sentence broke off there. Nothing followed, other than the hum of the opening frequency, lingering, then silence.

Thuyen let go of the flight plan keyboard, immediately switched to the emergency frequency, and called continuously. "Echo Tam Mot, Bach Lung Dai, hear the answer clearly. Echo Tam Mot, hear the answer clearly."

No response.

He reached for the internal phone and called airport duty, his voice had changed completely, hard and fast: "Activate the emergency plan, approach area at the end of runway thirty-five, lost contact with Echo Tam Mot, suspected accident."

Boi Thu sat motionless in the passenger seat, both hands clutching the edge of the chair, eyes still glued to the screen where the light dot of Echo Tam Mot had disappeared from the display area, leaving a small gap between the coordinate grid lines still present calmly as if nothing had ever been there.

Fire trucks and ambulances left the duty station in less than two minutes, red and blue lights swept through the radar room glass, reflecting brightly on the screen surface. Boi Thu remembers standing up, not because anyone told her to, but because her body needed to do something other than sit and look at the blank space on the screen.

"Sit down," Thuyen said, not turning to look at her, his voice still surprisingly controlled even though his hand on the keyboard was shaking slightly. "We still have a shipment in the air. Your job now is to observe, not panic."

She sat down. She did exactly as he said, for the next forty minutes, until the remaining flight landed safely and another controller was called in to take over the emergency shift.

The rescue team found the wreckage nearly a kilometer from the final approach road, in a small valley hidden behind a row of trees that the area's topographic map did not mark as a particularly dangerous spot. The flight instructor survived with serious injuries. Kha Nhat Vien, twenty-two years old, did not survive.

The next morning, when the night shift ended, Boi Thu met Thuyen at the parking lot. Both had not yet slept, his eyes were redder and sunken than any time she had ever seen. He didn't say much. He just stood there, holding the car keys but not opening the door, looking out at the dewy runway, where a fire truck was still anchored near the fenced-off scene area.

"I should have divided my attention better," he said, almost whispering, not quite addressing her. "Two shipments at the same time, in that weather, I shouldn't have let myself get caught up in the shipment."

“You followed the correct procedure,” Boi Thu said, the only sentence she could think of at the time, and one she would hear herself repeat, in a different way, eight years later, when Chuong Ba Vong said the same thing to her in his Tra Son office.

Thuyen nodded and did not refute, but his eyes showed that he did not really believe it, no matter what the later investigation conclusions said. He opened the car door, then stopped for a second, looking at her. "Thank you for sitting still last night and not panicking. Not everyone can do that on their first internship and witness this."

Boi Thu did not tell him that "sitting still" was not because she was calm. She didn't say a word for the most important thirty seconds of the entire night, and that silence he called calm, but she, eight years later, still hasn't found a more accurate name to call it.

The official investigation, released four months later, attributed the cause to a combination of inadequately predicted wind gusts, the possibility of the cadets becoming disoriented in poor night visibility, and a small delay in detecting trajectory deviations due to technical limitations of radar equipment at the time. Doan Khac Thuyen was determined to have followed correct procedures throughout the entire shift. There was not a single line in the one hundred and twenty page report that mentioned an intern who had been in the passenger seat, who had seen a dot of light off center thirty seconds before everything collapsed, and had chosen to remain silent.

Boi Thu never told anyone about those thirty seconds. Not because she thought it would change the investigation's conclusion — she had convinced herself enough times that even if she spoke up, Thuyen with twenty-two years of experience would probably make the same assessment, that it was just signal interference, that terrain gusts were difficult to predict with any equipment at the time. She didn't tell because every time she tried to open her mouth, she heard her own voice in her head, from that night: it was just the wind, he must have seen it.

She believed it long enough that it became a part of her memory that she could live with, putting it away in an unopened drawer, until ninety seconds on the radar screen at Tra Son last week, when she heard her own student hesitate just a beat before reporting something unusual — and she realized, with a cold clarity she hadn't allowed herself to touch in eight years, that she'd taught Bach exactly what she wished someone had taught her that night in Bach. Lung: speak up, even when unsure, even when a more experienced person is sitting right next to you.

That drawer, now, can no longer close tightly.