Originally Answered: Why does the international aviation industry still use non-metric units of measurement such as feet and nautical miles ? Probably because it is a standard that everyone uses already (not just the USA), and the risk of accidents if the standard was drastically changed is too high.

Method

1. Measure from Point A; which is the top of the bottom recess to Point B; which is the inside top of the the top recess.
2. Deduct 2 mm and this will be your height measurement.
3. The 2 mm is to allow the screen clearance when fitting.

Standard Units of Measurement

Example: Measure the width of the common house fly. This measurement is about the width of your pinkie finger. 10 millimeters is equal to this.

The International Civil Aviation Organization (ICAO) is the governing body that makes official aviation recommendations. It might surprise a lot of pilots that for years, ICAO has recommended that the aviation world move completely to metric units (SI Units): Meters.

Flying thousands of feet above the ground also means aircraft avoid much of the bad weather people on the ground are subjected to. You know the feeling when you see nothing but bluebird skies from your window seat, only to descend into your destination airport to dreary drizzle.

Answer: The highest commercial airliner altitude was 60,000 feet by Concorde. The highest military air-breathing engine airplane was the SR-71 — about 90,000 feet. The highest airliner flying today reaches 45,000 feet.

These rocket-powered planes are used mostly to collect data and are the only planes that can fly this high. Today, there are no business or commercial airplanes that are able to fly at 100,000 feet. It just isn’t possible.

35,105 ft

The simple answer is yes, pilots do and are allowed to sleep during flight but there are strict rules controlling this practice. Pilots would only normally sleep on long haul flights, although sleep on short haul flights is permitted to avoid the effects of fatigue.

Those white streaks planes leave behind are actually artificial clouds. They’re called contrails, which is a shortened version of the phrase “condensation trail.” Airplane engines produce exhaust, just like car engines do. As hot exhaust gases escape from a plane, the water vapor in the fumes hits the air.

How do airplanes stay in the air? Four forces keep an airplane in the sky. They are lift, weight, thrust and drag. Lift pushes the airplane up.

Air travel dominates a frequent traveller’s individual contribution to climate change. Yet aviation overall accounts for only 2.5% of global carbon dioxide (CO2) emissions.

The wispy ice clouds formed by jet exhaust help trap heat near the Earth’s surface. But small changes in altitude can dampen the effect, a study says.

of global CO2 emissions come from aviation. Together with other gases and the water vapour trails produced by aircraft, the industry is responsible for of global warming. This is because, mile for mile, flying is the most damaging way to travel for the climate.

Flying takes a lot of energy, which means releasing a lot of carbon dioxide into the atmosphere. Burning jet fuel releases greenhouse gases such as carbon dioxide into Earth’s atmosphere and oceans. Greenhouse gases block heat from escaping from the atmosphere, causing temperatures to rise just like in a greenhouse.