The term 'IMPORTANT AIRPORT' can be broken down into two crossword solutions: HUB (3 letters) and IMPORTANT (9 letters). A HUB is an airport that serves as a central connecting point for passengers and cargo. It is usually the busiest airport in a region, with many flights arriving and departing from it. An IMPORTANT airport is one that is of great significance to the region or country it serves, often due to its size, location, or the number of passengers and cargo it handles.