Even though I fly a lot, I retain the notion that air travel should be treated as a special occasion for which one should dress accordingly.

Back in the day, if you showed up looking as though you’d made a bit of a sartorial effort, the check-in person might pick up the phone, announce to reservations that a Mr Sutherland was ‘SFU’, and would rip up your boarding pass to replace it with a nicer one.