I read in Webflyer's review of the HiltonHonors: "There are 13 airlines with which HHonors members can earn miles during their business-rate stays. Regular earnings are 500 miles per stay with each airline, including: Air Canada, Alaska, America West, American, British Airways, Continental, Delta, Mexicana (1,000 kms), Midwest Express, Northwest, TWA, United and USAir. Six of these airlines also participate in the HHonors Reward Exchange program, where members can exchange HHonors points for airline miles and miles for points with participating partners. American Express
Membership Rewards and Diners Club Club Rewards also participate. For 5,000 airline miles, receive 10,000 HHonors points. Membership Rewards points can be exchanged at a rate of 1,000 for 1,300 HHonors points. Club Rewards points can be exchanged on a one-to-one ratio."

So check your Credit Cards and Airline-program rules to read about the specifi rules.