A busy airport is a place where many planes come and go, and it usually has a lot of activity. The term 'busy airport' can be broken down into three parts: HUB (3 letters), ORLY (4 letters), and OHARE (5 letters). HUB stands for a central point or location where passengers and cargo are transferred from one plane to another. ORLY is the name of the busiest airport in France, located just outside of Paris. OHARE is the name of the busiest airport in the United States, located in Chicago, Illinois.