Flight aggregators are online platforms that collect and display flight options from various airlines and travel agencies. They allow users to compare prices, routes, and schedules in one place, making it easier to find the best deals for air travel. Popular flight aggregators include Kayak, Skyscanner, and Google Flights. These services typically provide filters for preferences such as departure times, layovers, and airline choices. Once users find a suitable flight, they can often book directly through the aggregator or be redirected to the airline's website. This convenience helps travelers save time and money when planning their trips.