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By passing all the "green flag" tests that flight attendants give us without saying a word. Destanie Armstrong, who works with American Airlines, says "some passengers are really cool," and lists some of the things those passengers do right, such as:
When flyers greet her as they board
When they’re considerate about overhead bin space.
When they quickly give their beverage order
When they ask permission to be in the galley, where food and drinks are prepared
When they have good manners
When they avoid flirting if they’re married.