I can not state it any better than the email I received from American Airlines. If you are going to donate to a worthy cause in the wake of the horrible tragedy in Japan, you might as well get some free miles out of it.

American Airlines is partnering with the American Red Cross to help the victims affected by the March 10, 2011, earthquake in Japan and the resulting tsunami in the Pacific.

If you would like to join us in supporting the disaster relief efforts by making a cash donation, American will reward your generosity with an AAdvantage® bonus mile offer. Through April 15, 2011, AAdvantage members can earn a one-time award of 250 AAdvantage bonus miles for a minimum $50 donation, or 500 AAdvantage bonus miles for a donation of $100 or more to the American Red Cross.

Here is the link to donate and with the terms of the offer.