Hatfield Airport, the closest airport to the city of Hatfield, has recently opened a new terminal for AirJet International, a popular low-cost airline. Since the terminal has opened, Hatfield Airport has welcomed significantly more customers, to the extent that airline staff members have complained that they can no longer serve their customers efficiently. If AirJet International were to move their major terminal to the more remote Chesterfield Airport, the staff argues, the customers of both AirJet and the airlines based at Hatfield Airport would be happier.
Which of the following is an assumption that supports drawing the conclusion above from the reasons given for that conclusion?