I went to aa.com to see price out business class flights from ORD to LHR, choosing two dates at random, and got, for a round-trip ticket, $7,315.00. According to [1], however, you can (if I'm understanding all this correctly) upgrade from Most Discount Economy to Business by spending 25,000 miles and $300.00. Since [2] sells 25,000 miles for $625.00,