United Airlines SOP Practice Test

Supplemental oxygen is crucial in flight operations as it provides additional support for regular breathing, especially at high altitudes where the air pressure is lower and the concentration of oxygen is reduced. In these conditions, it becomes increasingly difficult for individuals to breathe adequately due to the thinner atmosphere. Supplemental oxygen improves the oxygen levels in the bloodstream, helping both crew members and passengers maintain proper physiological function.

Additionally, while supplemental oxygen may be available for passengers who request it, this does not capture its primary purpose in an emergency or during decompressions, where it is a critical safety resource for everyone on board, not just those who ask for it. It's also important to note that supplemental oxygen is an essential part of standard operating procedures in flight, especially since it can be a life-saving measure, rather than something that is rarely used or only for announcements, making its use span far beyond mere routine.