Can you please help me?

Travel Info
The cabins of commerical airliners flying at 30,000 ft are pressurized. Buildings in Denver, the "mile-high city," do not need to be pressurized. What is the best explanation for these observations?

Travel Tips

Most people can fairly easily tolerate an atmospheric pressure 25% less than normal. This is roughly equivalent to an elevation 2500 meters (8202 feet) higher than where they normally live. Older adults and people in poor physical health are more sensitive to low atmospheric pressure, while athletic adults are less sensitive.

Aircraft that routinely fly at altitudes of more than 3000 meters (9843 feet) generally require either supplemental oxygen (through a canula or oxygen mask) or cabin pressurization. Cabin pressurization is usually set for an equivalent elevation of 2000 to 2500 meters (5747 to 8202 feet). Source(s): Cabin Pressure at http://en.wikipedia.org/wiki/cabin_press...

Other Travel Tips
When you go up an additional 25,000 feet (more or less) the air is thinner. You don't need pressurization at 5,280. If I'm not mistaken, ailines are pressurized to the equivalent of about 8,000 feet.
Aeroplanes cruise at approximately six miles high. (this was the original title for the Byrds' Eight Miles High) The mile high club could refer to people who are so randy, they can't wait to get to cruising altitude. If you live in Denver, you would be used to the difference in pressure. When you fly to Ladahk, in the Himalayas, it is recommended that you spend your first day just sitting about doing nothing. I know of a guy who could't wait to go trekking and he died. Idiot.
As to the previous answer, now you know how Kenneth Lay comitted suicide.

I know better than to try heavy exercise whenyou have a change in altitude. We lose lots of ski visitors that way.
Living in Evergreen, CO ( 45 minutes from South Park! )