We are flying next month and our return flight is with southwest. In the past we have just checked in approx 24 hours in advance and got at least B boarding pass. It is important to us a family of 3 sits together. Our dd10 still gets a little sick/nervous when flying & dh is really tall so it makes it easier on him to stretch out if we are next to him. Is it still possible to be able to sit together if i dont take advantage of the earlybird checkin?