Final answer:
The trade winds are the regular air flow that assists sailing ships traveling from Europe to America.
Step-by-step explanation:
The term that describes the regular flow of air that assists sailing ships traveling from Europe to America by blowing from the west to the northwest is known as the trade winds. These persistent easterly winds primarily affect the tropics and were historically used by sailing ships crossing the Atlantic Ocean. The trade winds helped to establish trade routes between Europe and the Americas, contributing to exploration and trade during the Age of Sail.