Don't bother hitting the ATM before boarding your flight -- your airline may no longer be accepting cash.
Starting Aug. 5, Alaska Airlines will become the latest carrier to go cashless for in-flight purchases such as headphones, cocktails and snacks.
Others that have gone cashless include Frontier Airlines, JetBlue, AirTran, Virgin America and Midwest Airlines.
The "cashless cabin" is fast becoming the norm as more goods are sold in-flight and the hassles grow for making exact change, said Mike Boyd, a Colorado-based aviation consultant.
"Flight attendants practically have to walk on with a cash drawer," he said.
Northwest Airlines still accepts cash only for purchases on domestic flights. Delta and American airlines accept cash and credit cards, representatives said.
Going cashless won't significantly change airlines' profits for better or worse; in-flight sales account for a small slice of airlines' profits, Boyd said. Switching to credit-card-only may boost sales slightly, because people tend to spend more with credit cards, he said. But the primary benefit will be saving time on making change and accounting for cash transactions.
Visa Inc. is in talks with other airlines to go cashless, said Paul Wilke, a company spokesman.
"It's a win-win for both. It gives travelers the convenience of not having to have cash on them, and flight attendants don't have to worry about counting cash, having change on hand," Wilke said.
Airlines already use hand-held credit card swipers for duty-free shopping on international flights.
Those devices let attendants make quick, seamless transactions even in a darkened cabin when people are sleeping, he said.