On occasion, American Express Membership Rewards offers bonus miles when transferring to airline partners. From now until September 12, 2018, you can get 30% additional miles when you transfer MR points to Virgin Atlantic Flying Club. One of the sweet spots of the Flying Club program is to use miles on its partner airline, ANA to Japan. You can fly round trip in First Class from the east coast of the U.S. to Tokyo on ANA for only 120,000 Flying Club Miles. With this bonus, it will only cost 93,000 Amex Membership Rewards points. That’s an incredible bargain for a round trip First Class fare between North America and Asia.…