The cabin lights flickered.
It lasted less than half a second: a brief full-cabin dimming and return that was so fast most passengers probably hadn't registered it consciously. The man across the aisle, Mr. Callaway, looked up briefly from his laptop, frowned, looked back down. The woman in front of Zariah touched her overhead light, turned it off and on to check it, then left it on—routine reactions to what felt like routine turbulence-adjacent noise.
One of the flight attendants, a young woman named Keely, whose name Zariah had read off her nametag during the drink service, paused in the aisle with her expression momentarily still, then kept moving.
Zariah wrote in her notebook:
Cabin lights, brief full system flicker. 30-minute cruise. No turbulence at time of event.
A full-cabin power flicker wasn't an engine issue; it was a bus issue—the aircraft's electrical distribution system, which ran off the generators, which ran off the engines. A flicker that brief, absent any turbulence or visible cause, suggested either a loose connection somewhere in the distribution chain, or, less commonly and more seriously, a generator irregularity on the primary bus.
She thought about the fragment she'd overheard at the gate: "Delayed log sign-off. It's always fine." She thought about the interval in the engine sound. She thought about the electrical flicker. She thought: System instability. Not one fault—a pattern. These aren't separate things.
Her father's voice, from a training session so long ago she'd been barely tall enough to see the instrument panel: "In aviation, coincidences are rarely coincidences. When two things go wrong at the same time, look for the third thing that explains both of them."
She looked toward the front of the cabin. Keely was now at the galley, speaking quietly with the other flight attendant, an older man whose badge read Gerald. Gerald's expression was the practiced neutral of someone who spent a lot of time not alarming passengers. But his eyes, as he listened to Keely, flickered briefly to the cockpit door—just once, the way your eyes go to the source of a sound you're not sure you heard.
Zariah stood up. "Excuse me."
She stopped beside Keely at the galley. "I have a question about the aircraft."
Keely turned with a professional warmth that was clearly trained in. "Of course, honey. What's on your mind?"
"The cabin lights flickered a few minutes ago, and I've been noticing an irregularity in the left engine sound: a rhythm variation on roughly a 45-second cycle. I think there might be an issue with the electrical bus tied to the left generator."
Keely's expression held steady, but something in her eyes shifted—a brief recalibration. She glanced at Gerald, who had turned slightly toward them.
"That's..." Keely chose her words carefully. "Honey, the lights flicker sometimes. Air pressure, airflow... it can cause small fluctuations. Nothing to worry about."