Turbulence is random; the air shoves you and lets go.

This was rhythmic, mechanical, a shudder with a heartbeat to it, and it ran through the floor and the seats and my back teeth.

“How long has the column been oscillating like that?” I said.

“About ten minutes.” Reeves’ hands were tight on the yoke.

“It comes and goes.”

“Walk me through everything.

Fast.”

“Autopilot dropped out with no warning.