8,000’ is where most airlines cabin pressure is set. Some newer airplanes have a lower cabin altitude of 6,000’. All that assumes everything is working correctly...
Very few airliners are strong enough to have a 6000' equivalent cabin pressure.
Better sharpen your pencil on that one. 787-8 and the 777X and many of the VIP variants of other Boeing models are so equipped to handle the pressure. Most older airliners struggle to hold 8,000.
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