Charter airlines are companies that provide flights not available on regular commercial schedules. They operate on a charter basis, meaning they are hired by individuals, groups, or organizations to transport passengers to specific destinations. These flights can be more flexible in terms of timing and routes compared to traditional airlines. Typically, charter airlines serve vacationers, sports teams, or corporate clients who need to travel together. They often offer package deals that include flights, accommodations, and other travel services. Popular examples of charter airlines include Allegiant Air and Sun Country Airlines.