Delta Air Lines is now offering Diners Club Club Rewards members the chance to earn up to a 25-percent bonus when transferring Club Rewards points to miles.

Through March 31, members can earn a 10-percent bonus when transferring 40,000-78,000 points or a 25-percent bonus when transferring 80,000 points or more. For example, members transferring 80,000 Club Rewards points will earn 40,000 miles plus a 25-percent bonus. The resulting 50,000 miles are enough for two roundtrip tickets anywhere in the continental United States, Alaska, or Canada.

Once registered, members must call (800) 234-4034 to request the transfer.