What is the primary use for Portable Oxygen Bottles (POB)?

The primary use for Portable Oxygen Bottles (POB) is in medical situations. These bottles are designed to supply supplemental oxygen to individuals who may be experiencing breathing difficulties, such as passengers suffering from medical emergencies during a flight. In high-altitude environments, where oxygen levels are lower, POBs can effectively help those with conditions like hypoxia or other respiratory issues by ensuring they receive adequate oxygen to maintain their health and stability until further medical assistance can be provided.

While assisting passengers with altitude sickness and providing air for cabin crew can seem relevant, the specific and critical function of POBs is geared towards medical emergencies. Recreational use of oxygen is not a recognized function within the context of aviation safety and emergency protocols, thereby reinforcing that the primary objective of POBs is to respond appropriately to immediate medical needs onboard an aircraft.