The fare of MTR between any two particular stations is not calculated using a particular formula, and must be looked up from the fare table. Fares for the Airport Express Line are significantly higher. Services to checkpoint termini are also more expensive than ordinary fares. Adult fares range from HK$3.6 to $52.6 (US$0.46–6.74). Concessionary fares are usually half the adult fare, and range from HK$1.50 to $27.00. Student fares are the same as child and elderly fare on the urban lines, but are the same as the Adult fares for journeys to or from checkpoint termini, and range from HK$1.50 to $51.00. The fare is subject to adjustment in June every year.