Airliners are built for cold temperatures (it's –57°C at cruising altitude) and aviators welcome the denser air that comes with extreme cold.
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Small aircraft, rotorcraft and remotely piloted aircraft systems (RPAS) are especially influenced by winter weather due to their small size, low flight altitude and propulsion system. For aviation, icing is significant weather regardless of intensity and vertical location (at ground level or aloft).
The type of weather that delays and cancels flights is called inclement weather. Inclement weather is categorized as thunderstorms, snowstorms, wind shear, icing, and fog. Any inclement weather is by far the most hazardous. This is the type of weather that causes the most cancellations and delays, not just rain.
Low air pressure during air travel also decreases the amount of oxygen in the air. This effect is modest and generally not noticeable for healthy travelers. For patients with significant lung disease, a small decrease in available oxygen can cause significant symptoms, especially with exercise.
One in three people said that the most stressful part of travelling was during the flight, with a further 35% saying they found landing the most stressful. Boarding, finding your seat on the plane and the flight itself all came at the bottom of the list, making them the least stressful moments whilst travelling.
There are a number of effects altitude and airplane travel have on the body, including oxygen deprivation, alteration of sleep patterns, and an increased risk of contracting contagious diseases.
Commercial transport passenger planes are hit by lightning an average of one or two times a year. They are designed and built to have conducting paths through the plane to take the lightning strike and conduct the currents.
While it may seem hazardous on the ground, it is not uncommon for airplanes to fly in snow. This is because planes usually fly above snowfall, which makes it a non-factor for pilots and flight dispatchers. However, this is only true for commercial flights because they fly higher than smaller recreational aircraft.
Turbulence is a sudden and sometimes violent shift in airflow. Those irregular motions in the atmosphere create air currents that can cause passengers on an airplane to experience annoying bumps during a flight, or it can be severe enough to throw an airplane out of control. (The pilots) aren't scared at all.