
Passengers are accustomed to the idea that the price of a seat on a budget airline can vary wildly, depending on the strength of demand from other travellers. The Ryanair morning flight from Manchester to Malaga costs as little as £15 in November but more than £200 in July, for exactly the same three-hour flight
Travellers are also used to the principle that to take anything more than a small bag into the cabin requires the payment of a fee – that may on occasion be more than the price of the seat. That £15 fare to Malaga in November more than doubles if you want to wheel a larger case into the cabin (which also provides priority boarding).