Final answer:
It generally makes sense to fly from west-to-east (eastward) due to the prevailing winds known as the jet streams. The jet streams are high-altitude winds that blow from west to east and can greatly speed up an aircraft's journey when flying in the same direction.
Step-by-step explanation:
Flying east-to-west or west-to-east would depend on the prevailing winds. Prevailing winds are the dominant global winds that blow consistently in a particular direction over a region. In general, it would make sense to fly from west-to-east (eastward) due to the prevailing winds known as the jet streams. The jet streams are high-altitude winds that blow from west to east and can greatly speed up an aircraft's journey when flying in the same direction.
For example, on a flight from New York to London, flying west-to-east would encounter the headwinds of the jet streams, resulting in a longer flight time and more fuel consumption. However, flying east-to-west would benefit from tailwinds, making it a more efficient choice.