What emergency feature is standard on all modern commercial aircraft including Boeing and Airbus?

The standard emergency feature included on all modern commercial aircraft, such as those made by Boeing and Airbus, is the emergency oxygen systems. These systems are critical for ensuring passenger safety during an emergency, particularly in scenarios where cabin pressure may suddenly drop, such as during a rapid ascent or decompression event.

When the cabin altitude rises above a certain threshold (typically around 14,000 feet), the oxygen masks automatically deploy to provide supplemental oxygen to passengers and crew, allowing them to breathe comfortably until the aircraft can descend to a safer altitude or land. This design feature emphasizes the importance of passenger safety and is a regulatory requirement dictated by aviation safety standards.

The presence of emergency slides, fire suppression systems, and automated emergency landings are indeed important safety features in modern aircraft. However, the emergency oxygen systems are universally implemented as a standard feature on all commercial jets, reflecting their necessity for immediate response to cabin pressurization issues, which can occur on any flight.