Passengers can select a standard seat on Royal Jordanian flights from Chicago to Medina at no extra cost during the booking process. They can also opt for extra legroom seats, which are located near the emergency exits and offer additional space for stretching out. This option can be purchased during the booking process or at the airport. Passengers are also able to select preferred seating, which includes seats in prime locations like bulkhead and exit rows, or seats in the front.