Where is high-pressure liquid oxygen (LOX) typically found?

High-pressure liquid oxygen (LOX) is primarily found in multi-place aircraft, such as transport and larger military aircraft that require substantial oxygen systems to support crew and passenger needs at high altitudes. These aircraft are often designed with systems that accommodate the storage and distribution of compressed gases like LOX to ensure that all occupants can access the necessary oxygen during flights where ambient oxygen levels are insufficient.

In contrast, single-seat aircraft, while they may have oxygen systems, often utilize more compact solutions, primarily for the individual pilot rather than for a crew or multiple passengers. Commercial aircraft generally operate on pressurized environments and have alternative oxygen systems designed specifically for emergency situations, not high-pressure LOX supplies. Military helicopters are typically equipped with other types of supplemental oxygen equipment that are suitable for their unique operational roles, but high-pressure LOX systems are less common in these platforms, which emphasizes the prevalence of LOX in multi-place aircraft designed for broader operational capabilities.