Get 30 percent more miles when you transfer your American Express Membership Rewards points to Delta SkyMiles through March 31, 2011. There’s no limit to the number of points you may transfer into miles but you must register for the promotion before you transfer the points. It can take up to four weeks after point transfers to receive the mileage bonus, so keep this in mind when taking advantage of this offer.

For each conversion of points into the SkyMiles program, a fee of $0.0006 per point, with a maximum fee of $99, will be charged to your AMEX account. Visit http://delta.com/mrgetaway to register for the promotion.

Bottom line: Some targeted members of Delta received emails for a deal two steps further than this one–they get 50 percent bonus miles for transferring their Membership Rewards points for the first time ever. Also, if they transfer at least 50,000 AMEX points, they’ll get 25,000 elite qualifying miles–enough to get instant Silver Medallion status. This deal is valid through May. For more information, visit http://dmn.delta.com/offers/getmore