Those who take budget airline flights.
Seventy five per cent of budget airline flights are taken by social classes A, B and C, while people in classes D and E occupy just 6% of all available seats. Evidence that all this flying by relatively wealthy people broadens the mind is thin on the ground. Most of them are either rootless cosmopolitans winging their way from meeting to meeting round the world or vacationers looking for a sunnier home from home for a couple of weeks.
Do Professors no longer need to have an ear for language? "Rootless cosmopolitans"?