I'd be curious to see how the all-in price of airline tickets has evolved in recent decades. It feels like it's now commonplace to have hundreds of dollars in additional fees for things like legroom. That means a cheap ticket is a midrange ticket and a midrange ticket can end up being quite expensive unless you fall for the "we get to strap you behind the bathroom with only the clothes on your back" Saver ticket.
It also means that you're often still out actual money if you use award miles.
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