Question

A woman in the airport is handing out questionnaires to travelers asking them to evaluate the airport's service. she does not ask travelers who are hurrying through the airport with their hands full of luggage, but instead asks all travelers sitting near gates and not taking naps while they wait.

Answer 1

The answer is Convenience.
She aware that interrupting the people who are hurrying to the get would potentially disturb them from fulfilling a certain schedule.
The people who are sitting leisurely will most likely had some time to filled in the questionaire.