Plan to buy 4x UA air tickets about HKD$50000. I plan to use other currency such as TWD or CNY or USD. Credit card will charge me 1.85% to 3% depends on which bank. Need to charge $8xx more, but I can earn more asia miles. If using DBS black card: HKD$ = $6 per mile; Foreign currency = $4 per mile If using Fubon: HKD$ = $12 per mile; Foreign currency = $3 per mile (My HSBC 6x is Manning; HSBC 10x is not applicable) (My eye card 6x 13x are all exceeding the promotion ceiling) Dear brothers: any good suggestion Which credit card is the best for using foreign currency at this time??