The means of transportation when returning home is an airplane. So, when buying an air ticket, I have bought it since I studied to buy it as cheap as possible. Both JAL and ANA are selling airline tickets under similar conditions, do not they? Bon days and year-end and new year holidays are set with high price. If you purchase an air ticket by 28 days prior to your boarding day, you will be using the early pre-assignment system that you can buy at a discounted rate. Because the price is different depending on the time zone you ride, we have chosen the time zone that you can ride at the cheapest rate. This early installment system is very profitable. If the boarding day is decided in advance before 28 days or more, there is no way not to use this. There are cases where ticket fee becomes less than half price. In addition, even more advantageous tickets beyond this system may be released depending on the period. If you decide to buy an air ticket after 28 days have passed, you can purchase the shareholder preferential ticket for the airline company you plan to ride in the gold certificate shop. If you use a shareholder preferential ticket, the ticket fee will be half of the regular fare. I think that it is better to calculate the difference between the price of the preferential ticket sold at the cash voucher shop and the difference between the ticket fee currently on sale and judge whether it is better to use this. Anyway, in order to buy cheap tickets, early and early action is essential.