We forget everything: the books we read, the temples of Japan, the tombs of Luxor, the airline queues, our own foolishness. And so we gradually return to identifying happiness with elsewhere: twin rooms overlooking a harbour, a hilltop church boasting the remains of the Sicilian martyr St Agatha, a palm-fringed bungalow with complimentary evening buffet service. We recover an appetite for packing, hoping and screaming. We will need to go back and learn the important lessons of the airport all over again soon.