NEW YORK—(BUSINESS WIRE)—American Express announced today the launch of a new line of business, LoyaltyEdgeSM from American Express. LoyaltyEdge will work with strategic business partners and merchants to create, implement, and/or enhance their customer loyalty programs in order to help attract and retain customers, thus driving incremental business growth. Long-time strategic partner, Delta Air Lines, is the first to utilize the services of LoyaltyEdge.“Highest in Customer Satisfaction with Credit Card Companies&rdquo....