- 1 十年 前最佳解答
No, cruising at 40,000ft isn't rare at all. In fact the majority of modern jet airliners is certified to fly above 40,000ft and it's particularly common on long-haul operations where flying at higher altitude will achieve better fuel consumption and engine performance. For example from Sydney to Hong Kong, Cathay's A333s typically operate at the range of 35,000 to 41,000ft. With the initial altitude at 33-35,000ft, they gradually climb to 39-41,000ft at mid-way depending on the direction. Then all the way to the top of descend point.
But most jet operations are constrainted below 45,000ft due to the extra-terrestrial ionising radiation issue. The only regular public transport operations of jet airliners at the altitude above 45,000ft in history were operated by Concorde due to the need of leaned air density and more stabled air to achieve supersonic performance.
For the highest flight altitude achieved by manned aircraft, it's depended on how you define an aircraft. For manned vehicle laterally all spacecraft including space shuttle fly above 380km. But since their flight dynamic is achieved by the use of external booster (in the other words, rockets) at the initial flight stage (that means the launch) and being held on the orbit (i.e. level flight) by the inertial force (so no thrust) which maintains the vehicles at the Escape Speed (in plain words, the speed to get away from a planet), it doesn't count as an aero-dynamic vehicle (in our words, airplane). The recorded manned airplane operation with the highest altitude achieved is the SpaceShip One flight on 21st June 2004, at the altitude of approximately 100km.
- wilsonLv 71 十年 前
there is a contradiction in your two posts:
13km (second post) = 42,900ft.... this is outside the range in the first post...
2006-12-02 13:16:43 補充：
cruising at 40,000 ft is pretty rare.
2006-12-02 14:58:00 補充：
cruising above 40,000 ft is pretty rare.
- 1 十年 前
上篇所說的10000呎是國內線的高度，附註一點 國內的規則是北單南雙，意思是往北飛的國內線飛行高度為 11000 or 13000呎，往南飛的則為 10000 or 12000呎。
長程飛機為避免亂流，一般都飛在對流層之上平流層底部，遠程航線的飛機飛行高度多數均在一萬公尺以上。資料來源： Yahoo!奇摩知識+ (please don't copy for the answers)