You will earn two (2) additional Points for every $1 in eligible Net Purchases during each billing cycle for transactions made directly with merchants who classify their business as a travel category transaction (such as purchases made directly with airlines, hotels, car rentals, taxicabs, limousines, passenger trains and cruise line companies), and for transactions using a mobile wallet.
Real time reward的term是一样的，只是另外要求境内美元结算。
直接付给航空公司，酒店，租车，出租车，limo，火车，邮轮可以。不保证其它不行。
另外，境外非美元支出可以获得3X，不能real time reward。有明确的DP说OTA，toll，parking不行。
换言之，你用Costco Travel或者Expedia预付的话是不行的，到店支付则没问题。如果能用ApplePay，那可以3X，但不能触发兑换。
其实兑换很简单的，real time reward是根据preauthorization触发，不是根据post触发，也不care退款（比如机票24小时）或者预授权与post金额不符（比如租车酒店的押金）。我没有故意触发过（因为已经很容易花了），但这也算奇技淫巧吧，所以风险自负。