With the advent of Basic Economy seating on many American Airlines flights, travelers may find themselves scouring terms and conditions in order to differentiate policies and figure out what is, and isn’t, included in their airfare.

When American Airlines launched its basic-economy fares, it essentially took away previous inclusions and instead began charging extra for things like carry-on bags, bumping passengers into the “regular economy” level of seats. When the airline learned this extra fee wasn’t changing much in its pricing model, American decided to start experimenting with removing yet another previous inclusion — the ability to select your seat at the time of booking for no extra fee.

The risk with implementing this new fee is some passengers may not care about where they sit and therefore won’t pay extra to secure a seat. But for those who do want to book their seat in advance, they will now have the opportunity to do so up to seven days in advance of their flight, rather than waiting for the 48-hour pre-flight window.