A charter airline is a type of airline that provides flights on a non-scheduled basis. Unlike regular airlines that operate on fixed routes and schedules, charter airlines offer flights that can be booked for specific trips, often catering to groups or organizations. These flights can be arranged for various purposes, including vacations, corporate travel, or special events. Charter airlines typically operate smaller aircraft and may serve destinations that are not accessible through commercial airlines. They often provide more flexibility in terms of departure times and routes, making them a popular choice for travelers seeking customized travel experiences.