## How fast can a 747 fly?

The top speed for a 747 is about 570 miles per hour (mph), and this flight topped out at 825 mph.

## Which is faster 747 or 777?

Question: What is the fastest airliner and how fast does it fly? — submitted by reader James Kriplean, Knoxville, Tenn. Answer: The Boeing 747 can cruise at 92% of the speed of sound, Mach. A 777 engine may be equal to two 747 engines, but the wing is not designed to take such a large engine in one place.

## How fast do passenger planes fly?

This altitude is usually where the higher ground speeds, the increase in aerodynamic drag power, and the decrease in engine thrust and efficiency at higher altitudes are balanced. The typical cruising airspeed for a long-distance commercial passenger aircraft is approximately 880–926 km/h (475–500 kn; 547–575 mph ).

## Why do jets fly at 35000 feet?

The “sweet spot” of flying is regarded as between 35,000 and 42,000 feet – too high and the oxygen becomes too sparse to fuel the engines, too low and the air resistance is greater. This optimum height is linked to the usual weight of a commercial jet – that is, heavier planes fly lower, and lighter higher.

## Has a 747 ever broken the sound barrier?

As it shot across the Atlantic, the Boeing 747 -400 jet reached a top ground speed of 825 mph. However, the jet did not actually break the sound barrier, because that is measured by its airspeed, or the speed of the plane relative to the air through which it is traveling.

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## What is fastest jet?

The Lockheed SR-71 Blackbird is the fastest jet aircraft in the world, reaching speeds of Mach 3.3–that’s more than 3,500 kph (2,100 mph) and almost four times as fast as the average cruising speed of a commercial airliner. Key elements of the SR-71’s design made this possible.

## How many hours can a 777 fly without refueling?

The longest that a commercial airplane has flown without refueling is a little over 23 hours. This was achieved by a Boeing 777 -200 LR that flew between Hong Kong and London, covering a distance of almost 20,000 km.

## Which is the fastest airliner in the world?

North American X-15 is the first on our top 10 fastest aircraft in the world list. This aircraft has the current world record for the fastest manned aircraft. Its maximum speed was Mach 6.70 (about 7,200 km/h) which it attained on the 3rd of October 1967.

## Why do planes do not fly over the Pacific?

The primary reason airplanes don’t fly over the Pacific Ocean is because curved routes are shorter than straight routes. Whether a commercial airline is flying from the United States to Asia or elsewhere, it will have the fastest and most fuel-efficient flight by performing a curved rout.

## What is the most dangerous part of a flight?

Boeing research shows that takeoff and landing are statistically more dangerous than any other part of a flight. 49% of all fatal accidents happen during the final descent and landing phases of the average flight, while 14% of all fatal accidents happen during takeoff and initial climb.

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## Do planes turn their engines off?

“They’re still operating and powering crucial systems, but providing no push. You’ve been gliding many times without knowing it. It happens on just about every flight. “Obviously an idle-thrust glide is different from the engines quitting outright, but even then, the glide itself would be no different.”

## How cold is it at 35000 feet?

How cold is it up there? The higher you get, the colder it gets, up until 40,000 feet. If the temperature at ground level was 20C, at 40,000 feet it would be – 57C. At 35,000 feet the air temperature is about – 54C.

## Why do planes fly at 38000 feet?

The biggest reason for this altitude lies with fuel efficiency. The thin air creates less drag on the aircraft, which means the plane can use less fuel in order to maintain speed.

## What happens if a plane flies too high?

When the plane gets too high, there is insufficient oxygen to fuel the engines. “The air is less dense at altitude, so the engine can suck in less and less air per second as it goes higher and at some point the engine can no longer develop sufficient power to climb.”