14 CFR §25.831(b)(2) states the following "the maximum concentration of CO2 during FLIGHT must not exceed 0.5 percent by volume (sea equivalent) in compartments normally occupied by passengers or crewmembers."


What is the exact definition of FLIGHT by the FAA? I can not find the definition of FLIGHT. It must be listed in the CFR I am sure, but I can not find it.