This advice would apply to any bassinet seating, but in essence they are held back until OLCI, at which point these seats are fair game to anyone. There is a period from 72 hours to OLCI time when you can call in and ask to move to these seats, but it doesn't always work, it sometimes seems easier from 48 hours to 26 hours for some reason. In other cases an agent simply can't take the seats before OLCI no matter how hard they try, but that would also stop anyone else from getting those seats until OLCI too.