The big airlines have jumped into the “basic economy” market, competing with the super-cheap airlines that cater to the most frugal passengers.

Within hours of each other, American and United announced that they had begun selling basic economy fares that push down the price of a ticket. The lower price can come with caveats, however, including having to pay extra for space in the overhead bin, boarding last and not having the option to pre-select seats when booking the tickets.