It's unlikely we'll ever see a ATM onboard an aircraft, and we know how flight attendants bristle at the mere mention of making change, so this next development will likely be embraced by the airline traveler. American Airlines is testing a cashless proposition on its San Francisco departures for the next three weeks and will only accept major credit cards or debit cards for onboard purchases, including headsets, snacks, light meals and alcoholic beverages.

The cashless test will help American determine if passengers in the main cabin prefer to pay for onboard items with plastic. The test will include more than 700 scheduled flights between Sept. 10 and Sept. 30 and receipts will be provided to passengers upon request. 

I see one problem for me, though a boon to American; I spend more when I brandish a credit card. Oh wait...now I get it.