Continuous duty overnights (CDOs) are also referred to as "stand-ups", "naps", or "high-speeds" is a scheduling practice used in regional airline operations to circumvent, or "outsmart" government flight crew minimum rest requirements. A few major airlines may also use them.
A crew working a CDO will generally operate the last flight out at night, have on duty time on the ground (anywhere from 0–8 hours) at the destination and then operate the first flight back in the morning. Since the break between flights is not sufficient to qualify as a free from duty rest period, the crewmembers remain continuously on duty, even though they may have been provided with a hotel room for rest. Crew members would normally require a specific amount of resting hours in between shifts based on their countries and airlines but by using the term continuous duty, they are able to go beyond the specified rest period due to being on duty.
Another factor is delays. Because of this set up; delays taken throughout the day that result in a delay the last flight (first flight of a CDO) do not impact the first flight the next day. It would simply reduce the amount of time the crew are on the ground.
The continuous duty overnight schedule could be flown 3–5 times consecutively (i.e., back-to-back).[1]
^Fatigue Factors in Regional Airline Operations Archived 2008-04-29 at the Wayback Machine, NTSB
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