In this lecture, the professor is describing what affects the polar jet stream has on the times taken for flight journeys. He used an example of flight journeys between
He states that the reason that the flight journey from LA to NY is one hour shorter than the flight journey back from NY to LA, is because there is a jet stream that the airplane is travelling within. When a plane is flying from LA to NY, it is travelling at the same direction as the jet stream which would push the plane, thus making it move faster with less amount of fuel consumed. However, when a plane is travelling back from NY, it experiences a stronger backward force, eventually making it fly at a slower speed consuming more fuel. This is why the price for the tickets varies even though the distances travelled are equal.
Jet stream is an irregular stream of air that is very high in the Earth’s troposphere that decides on most of the weather patterns. There are two types of jet streams, subtropical and polar but the jet stream mentioned in the lecture is the polar jet stream. A stream of air in the high troposphere can only be called a jet stream when its speed is over 57 miles per hour and sometimes in winter it can have a very high speed reaching 300 miles per hour. This is why they affect the flight journey times so greatly. Also, the jet streams tend to carry storms with them as they move which may affect the flight journeys too.
chum sak bu tak hae yo! pls... what do you think the score would be for this?