Once upon a time, a holiday would begin with a queue at the airport check-in desk. Today, most of us are able to head straight to security after checking in online from home. If you have a suitcase, you can usually drop that off at a machine at the airport that also prints out your baggage label that you attach yourself. So recent reports that Europe’s largest airline plans to abolish airport check-in desks altogether next year seemed like a logical step. Budget airline Ryanair already charges €55 ($59) if you want to check in at the airport, driving many to check in online instead. But when a…