passenger aircraft?

medium-sized and above aircraft are flying at high altitude, which refers to the space of 7000-12000 meters above sea level. In this space, 1 kilometer is taken as a height layer, which is divided into 6 height layers: 7 kilometers, 8 kilometers, 9 kilometers, 10000 meters, 11,000 meters and 12,000 meters. Airplanes flying at high altitude are only allowed to fly above the specified altitude.

In addition, when civil aviation aircraft are flying, the zero-degree boundary is directly south and north. Any aircraft with a heading to the right (east) will fly to the even-numbered high-rise, I .e. 8km, 10000 m and 12,000 m height layers. Any aircraft heading to the left (west) flies to the odd-numbered height layer, I .e. 7km, 9km and 11,000 m height layers. In this way, planes flying in opposite directions are not at the same altitude, avoiding collisions.

the maximum flight altitude of different aircraft aircraft on short routes generally fly between 6000 meters and 9600 meters, while aircraft on long routes generally fly between 8000 meters and 12600 meters. At present, the maximum flight altitude of ordinary civil airliners will not exceed 12600 meters, and some business aircraft can fly at a height of 15000 meters.

B737-300 (Boeing 737-300 aircraft) 32.8 fuselage height (m) maximum number of passengers 145 maximum payload (kg) 15200 maximum flight altitude (m) 11280 range (km) 5460 maximum cruise speed (km/h) 831.

(Boeing 757-200 aircraft) 47.33 fuselage height (m) 6.25 maximum passenger number 200 maximum payload (kg) 24460 maximum flight altitude (m) 11280 range (km) 6319 maximum cruise speed (km/h) 928.

(Boeing777-200 aircraft) Captain of Boeing Aircraft Company of the United States: 63.73 fuselage height (m) 18.45 maximum number of passengers 380 maximum payload (kg) 54930 maximum flight altitude (m) 15000 range (km)

Why are civil aviation crews and passengers not equipped with parachutes? the flight altitude of civil aviation aircraft is much higher than that of parachuting, the air is thin, the ultra-low temperature, and the parachutists drop to a height where they can survive (4000 meters), it would have become a hard corpse. Even if the plane ventured to a low altitude, the strong relative airflow at about 400 kilometers per hour would blow the skydiver to the tail and kill him. Therefore, the plane used for skydiving mostly opened the tail. What's more, parachuting for untrained people is similar to jumping off a building when grounded, so neither the civil aviation crew nor the passengers are equipped with parachutes.