If you are missing points for the full amount required for a bonus ticket or upgrade, you can supplement the difference with money. Points can be purchased at any amount. The price for purchasing a supplementary point is $1.00

For your information:
Payment for bonus tickets is made the following way:
Points + money supplement
The prices of bonus tickets are subject to change at any time and are not updated online.
The effective price is the fare at the time of ticketing.