The website explained that reservations will ensure the passenger gets two adjacent seats at the same rate.
For those who don’t book two seats in advance ahead of time, an airport agent will find out if two seats are available together.
If the passenger is offered a seat in a higher class of service that provides more space, the passenger will be possible for the fare difference.
If adjustments can’t be made on the original flight, the affected passenger can purchase seats on a different flight at no extra cost.
American Airlines also offers a variety of seat options including Flagship First, Flagship Business, First, Business, Premium Economy, Main Cabin Extra, Main Cabin and Basic Economy.