Earning 5X Membership Rewards on Flights With the Platinum Card: What Works, What Doesn’t

The Amex Platinum earns 5X points on flights booked directly with airlines or through Amex Travel, but book the wrong way and you'll only earn 1X. Here's exactly which airfare purchases qualify, which don't, how award taxes and fees factor in, and whether the Platinum Card is still the best option for booking flights.