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Skytrax's World Airport Awards are based on 12.1 million survey questionnaires filled out by passengers covering 108 different nationalities and 395 airports worldwide during a nine-month survey period in 2012 and 2013.
CNN: U.S. airports don't stack up
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The NFER research was based on a survey of 3, 789 schools which had responded to a similar survey in 2006, plus questionnaires sent to all local authorities in England.
BBC: More primaries teaching languages
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Southwest launched a new survey program last year that sends questionnaires to customers the day after they fly.
WSJ: What United, American, Delta, Southwest, JetBlue, Alaska, Virgin America Airlines Learn From Customer Surveys
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Many broad email questionnaires get response rates under 5%, survey experts say.
WSJ: What United, American, Delta, Southwest, JetBlue, Alaska, Virgin America Airlines Learn From Customer Surveys
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The findings, published in the New England Journal of Medicine, come from 60, 290 questionnaires filled out by women in the Nurses' Health Study, a survey of more than 121, 000 female registered nurses begun in 1976.
BBC: Exercise reduces gallstone risk