"It wasn't an airflow fluctuation," Zariah said. She kept her voice quiet and level. "It was a full-cabin event, every light at the same time. That's a bus event, not a localized one. And it aligned with a change in the engine rhythm I've been tracking."
Gerald had put down what he was holding. "How old are you?"
"Twelve. But I've been studying aviation for most of my life, and I run a professional-grade flight simulator. I'm not guessing." She paused. "I just think someone in the cockpit should know about this."
The two flight attendants exchanged a look. It was a brief look, but Zariah was good at reading them: it said, This kid is saying something strange, and I don't know how seriously to take it.
"I'll mention it to the captain," Keely said. Her tone was the tone of someone who was almost certainly not going to mention it to the captain. "Thank you for letting us know."
Zariah looked at her for a moment, then nodded and went back to her seat.
She was still watching the man in the middle seat when it happened. He'd been still for a while—long enough that she'd wondered if she'd misread him, if the nervous energy had been travel anxiety, nothing more. But now he was standing, holding his carry-on, looking toward the rear of the aircraft.
He said something to the passenger next to him—a polite word, the kind you say when you're squeezing past—and moved into the aisle. He walked toward the back of the plane. He passed the lavatories, passed the emergency exit row, slowed slightly—barely—near the rear equipment access panel on the left side of the fuselage. She couldn't see what happened next from her seat, but he was back at the lavatories for barely 60 seconds before he was walking back up the aisle: bag over his shoulder, expression fully composed.
Too composed. The composure of someone who'd done something and was now actively performing calm.
Zariah wrote in her notebook:
SQ passenger, rear panel area, 60s, bag in hand both directions.
SQ—suspicious quiet. She'd invented the notation herself.
The aircraft pitched: not violently, not the sharp lurch of severe turbulence. It was a softer, stranger movement—a sudden differential, like one wing had momentarily lost a fraction of its lift relative to the other. The plane recovered within two or three seconds. Most passengers registered it as light chop and went back to their screens, but the recovery hadn't felt clean. It had felt corrected—as if the autopilot had caught something and compensated, which was exactly what autopilot was designed to do, except that the correction had been slightly heavy, slightly overtuned for the magnitude of the deviation.
Zariah knew what that felt like: she'd induced similar oscillations in her simulator to test autopilot response behavior. The overcorrection pattern was characteristic of autopilot working harder than it should, fighting a trend rather than managing stable flight.
The left engine tone, the electrical flicker, the altitude fluctuation... She felt it then: the shape of it assembling in her mind the way a picture assembled on a screen as the resolution loaded pixel by pixel until suddenly there was something recognizable.