1.   Both the airlines and the businesses that offer miles also benefit by sharing computerized lists of their best customers, to help in future promotions.

2.   Delta is offering double miles for every purchase using a Delta SkyMiles credit card from American Express.

3.   Many car dealers are offering miles for test-driving a car, and thousands more for actually buying one.

4.   Such centers offer miles of groomed trails, ski rentals, lessons, and food ranging from your basic hot chocolate and chili to gourmet spreads.

5.   The owners of a foundry asked Midwest Express about offering miles to its customers.