At what altitude does a boeing fly in the middle of the flight and why ?

Answer 1

They usually fly in the range of 30,000 ft to 37,000. The reason for this is because the aircraft runs more efficiently at the higher altitudes.

Answer 2

The previous 2 answers gave you a correct idea of altitude. For WHY: At the begining of a typical flight, the plane is heavy with fuel and trying to get to an efficient cruise altitude results in an inefficient cruise speed (slow). As the plane lightens with time, the altitude can and frequently is increased to take advantage of the higher speeds and lower fuel consumptions available at the higher altitudes.

All this theory is subject to other factors such as weather, other conflicting traffic, etc, so the final altitude depends on many things........

Answer 3

Mostly in the 30s, sometimes in the 40s, once in a while in the 20s.

Commercial jets have two versions of maximum speed, their maximum airspeed and their maximum mach number.

So there are reasons to fly higher and there are limits to how high you can fly.

As the aircraft climbs the air becomes thinner and colder, this reduces drag and lift but allows the engines to run more efficiently. The aircraft gets round this by using indicated air speed, which is what the air speed feels like to the aircraft in pressure terms. What that means is that as you climb at constant indicated air speed your ground speed increases, but your fuel consumption decreases because the engines run more efficiently.

As you climb the speed of sound also decreases.

Eventually you reach an altitude where the mach number becomes the limiting factor. You are now going as fast as you can. From now on as you climg at maximum mach number your ground speed decreases.

So you cruise at the most fuel efficient altitude that you can while still getting where you are going on time.

But what about the relationship of load to cruise altitude?

If you fly at a set altitude and speed then you require a certain amount of power. If you add weight then you cause an increase in drag and you have to add power to maintain speed. So as weight increases your maximum altitude decreases. As you add power fuel usage increases rapidly, so you only want to use so much power. So there's a complex relationship which limits your operating altitude. As fuel load decreases the drag decreases and you can climb higher.

At high altitude aircraft cruise near their maximum mach number and not far above their minimum indicated air speed.

Answer 4

At about 35,000 or so, give or take a few thousand. They fly there for the same reasons they would do so during the day. Increased fuel efficiency, reduced drag, stronger tailwinds, increased true airspeed, etc

Answer 5

............... YOU KNOW THERE IS GRAPH for optimum altitude for a given length of a flight ................ that is how they choose the cruising level ............. and the max height called ceiling of the Boeing 737 aircraft is 41000 feet ................. depends on the series .....

Answer 6

It flies around 30 000 feet depending on weather and conditions.

Answer 7

30,000 feet. No noise, keeps it away from other flight paths. Also plenty of time if it is going to crash to glide away from houses

Answer 8

30,000-38,000 ft