The UK aviation industry operates in the private sector. Airlines choose where to base aircraft, where to fly, what fares to charge, what in-flight service level to provide and which aeroplanes to use. However, the Consumer Rights Act 2015 requires all airlines to have fair terms and conditions. Contract terms would be deemed unfair if they create significant imbalance in favour of the business. The Civil Aviation Authority is responsible for ensuring that airlines comply with this legislative requirement. It conducted a review of airline contract terms in 2019, which included looking at fees for check-in and printing boarding passes at the airport. The report stated that whilst there is a rational and objective basis for the existence of such rules, they should be aligned to the actual administrative cost of the service. The CAA found that in some cases fees were not proportionate, and recommended that airlines review their fees so that they are more explicitly aligned to the actual administrative cost of providing the function. The CAA keeps the contract terms of airlines under review.