For every mile you donate, the airline donates three. The minimum donation is 10,000 miles. Minimum donations are 5,000 miles with 1,000 increments. TWA sends its donated miles to the Salvation Army. Aviators members donate a minimum of 1,000 miles, and in increments of 1,000 miles.
Several charities benefit.
Those miles, in 1,000 mile increments, can be donated to any of a dozen charities. If your airline or card company is not listed, call the company yourself. They may have programs that are not mentioned on this list.