Businesses in this category operate air services that run on regular, published timetables rather than being arranged solely for a private group or individual. Services may connect cities, regions or islands within the UK, or provide international routes. Operators typically sell seats to passengers and provide scheduled departures, reservations, check-in, boarding and the carriage of hand luggage and checked baggage, subject to the conditions of each service. Depending on the route and aircraft, these businesses may provide regional or commuter flights as well as services between larger airports. Their operations involve planning routes and timetables, maintaining aircraft, employing flight and cabin crews, and coordinating with airports and ground-handling providers. Customers may also receive assistance with connections, special travel requirements or disruption, in line with the operator's policies and applicable aviation rules.