All points-earning American Express cards are offering double points on retail, dining, and entertainment expenses from June 15 – July 15 (up to 10,000 bonus points) to residents of the greater Boston, Chicago, Denver, Houston, Philadelphia, Washington, D.C., and Los Angeles areas. Registration required.

Update: As the first reader comment observes (and as I posted elsewhere yesterday) the geographic limitation applies to all Amex cardholders except those with the Delta American Express. It appears as though the bonus is open to all Delta cardholders regardless of residency.

For the month up until June 15, targeted cardholders of the Delta Skymiles American Express earn double miles on all spending over $1000. Registration is required for this one, too.