I believe LGB is an airport where they board from both front and back and a lot of people try to rush the front maybe you can be the few who make the run for the back door and maybe the last couple rows will have a few seats available since that longer line of people trying to get the front will move slower
you can always ask for extra time boarding maybe they can help which is between A and B groups or check back later to see if you can upgrade boarding for 1 person and then save a seat
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