When only credit cards are accepted at 35,000 feet

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Since last week, Southwest Airlinesno longer accepts cash for purchases mid-flight. Only credit or debit cards are accepted. Analyst Henry Harteveldt shares with The Big Money his prediction that all major U.S. airlines will have cashless flights within a year.

Why? It's faster, it reduces theft, and it encourages passengers to spend as much as 50 percent more.

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