A couple of weeks ago the New York Times ran a piece pointing out that while plane passengers are asked to turn off their mobile phones during take-off and landing, no-one knows why. The Times speculated that if just 1% of American plane passengers secretly left their devices on, that meant 11 million flights a year somehow managed to stay in the air even though someone had left their phone on.
The 1% number was just a guess, though. So last week I got the guys at my company, Holiday Extras, to run a poll and ask our customers. We run our polls on the "welcome back" email we send to customers, so we know that all of our respondents have just flown back from a holiday.