That would indicate "you are next" was being used as a substitute for either/both of "line up and wait" and "cleared for take-off." While that's certainly poss

That would indicate "you are next" was being used as a substitute for either/both of "line up and wait" and "cleared for take-off." While that's certainly possible, it would be surprising. Typical ATC commands at a busy commercial airport would be something like: "Taxi via XYZ, hold at ABC" (where ABC is close to, but a safe distance from, the runway surface) "Line up and wait" (enter the runway, but hold while existing traffic clears the runway) "Clear for takeoff" (runway is clear, you may depart) In this incident, I don't think either of those last two commands were given.