roundout
VNAV monitor
This isn't a rule that can really be bent, between departing jets the required runway separation is 6000ft AND airborne, that means the succeeding aircraft cannot start their takeoff roll until the preceding aircraft is wheels up. If you have already been put in position on the runway, it cannot be anticipated either. Visual separation is only approved on the runway for helicopters and for touch and go aircraft to reduce the wake turbulence delay.
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