Most commercial airlines fly above much of the clouds, though they do still have to fly through them to get in and out of the airports. A typical commercial jet has a cruising altitude of around six to seven miles (nine to 11 km) above sea level.
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Aerodynamic altitude: If a commercial airliner flies too high, it will encounter less dense air passing over the wings to create lift. This can cause the plane to stall and fall out of control. Depending on the weather conditions and aircraft weight, this can occur anywhere between 40,000 and 45,000 feet.
Whether flying at night or during the day, pilots need to see some kind of horizon. They use this to determine the airplane's attitude. At night pilots will turn their gaze from outside to inside and use the artificial horizon. The artificial horizon is normally a simply globe split into two hemispheres.
Lenticular and Mammatus Clouds: Avoid the AreaAvoid flying close to lenticular clouds because they are important indicators of localized strong wind and heavy turbulence along mountain ranges.
Aircraft Instruments that Help the Pilots See in CloudThe pilots also have a weather radar which can be viewed on their screens and this can help them determine what type of cloud it is they are flying through (or approaching), how much water there is in the cloud, and if there are more clouds behind it.
Numerous accidents have occurred in the vicinity of thunderstorms due to the density of clouds. It is often said that the turbulence can be extreme enough inside a cumulonimbus to tear an aircraft into pieces, and even strong enough to hold a skydiver.
Mammatus cloudsAirline pilots will normally take action to avoid any cumulonimbus clouds, but particularly those bearing mammatus formations, as these indicate especially severe turbulence within the cumulonimbus.
This shaking is caused by turbulence. While this might make some uneasy, there is nothing to worry about as modern airplanes are designed to withstand all types of turbulence.
The biggest reason for flying at higher altitudes lies in fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed. Less wind resistance, more power, less effort, so to speak.
If a plane is flying along at a constant speed and height, then suddenly the headwind reduces, or it enters a descending column of air, this can cause the aircraft to suddenly descend, Gratton explained.
Your chances of being involved in a fatal plane crash are incredibly small – around 1 in 11 million, according to Harvard researchers. While your odds of being in a plane accident are about 1 in 1.2 million, survivability rates are about 95.7% – so the odds are with you no matter how you look at it.
“The first step in avoiding an encounter with clouds at night is a good weather briefing. This weather briefing will give you an idea of where the cloud layers are expected. However, don't expect these forecasts to be precise because they are simply that: forecasts.
Understanding these speeds can provide a fascinating insight into the realm of aviation. On average, commercial planes cruise at about 575-600 mph (925-965 km/h, 500 to 521 knots, 0.78 to 0.81 Mach). Private jets typically cruise at around 500-600 mph (805-965 km/h, 435 to 521 knots, 0.68 to 0.81 Mach).
And that at cabin altitudes above 14,000 feet pilots must use oxygen at all times. And that above 15,000 feet each occupant of the aircraft must be provided supplemental oxygen. All of this is spelled out in Federal Aviation Regulations Part 91.211.