Why The Airbus A350 Has Such A Low Cabin Altitude

Passenger aircraft cruise above 30,000 feet, and at this altitude, the air is too thin for people to breathe. Aircraft are not pressurized to sea level altitude (0 feet) equivalent, as that would put too much strain on the fuselage and accelerate its fatigue. Previously, the compromise for widebody aircraft was being pressurized to the equivalent of around 8,000 feet. However, new aircraft like the Airbus A350 are able to increase the cabin pressure to around 6,000 feet.