For operational reasons, seat selection can be overwritten on the day of travel. In the event your booking is affected by such changes we will attempt to ensure that you get a seat in a similar location or of equal value to the one you originally selected even though your seat number may change.
Airlines must have this information before passengers can be checked in for flights to and/or from the USA.
Passengers who refuse to supply this information may be restricted from entering the country by the country's immigration department.
This information may be submitted online via this 'Manage Booking' area.