>> True, however air density at 70K feet is about 1/20th of sea level. source: http://www.engineeringtoolbox.com/standard-atmosphere-d_604.html http://www.engin

>> True, however air density at 70K feet is about 1/20th of sea level. source: http://www.engineeringtoolbox.com/standard-atmosphere-d_604.html http://www.engineeringtoolbox.com/standard-atmosphere-d_604....