Everyone beat me to it, bgbg4us. Southwest doesn’t assign seats. You have to cue up in a preassigned order based on the letter/number you get. I recently flew on southwest and did not pay for the earlybird checkin. I checked i IMMEDIATELY at 24 hrs prior to my flight and got something like B 19. I was still able to get a window (I usually take aisle and plan to go back to that). The person who sat next to me in the center seat was significantly overweight (and very inconsiderate about his overuse of space) dirty, smelly, and had long hair (very unwashed) down to his waist that spilled all over me when he decided to put his head on his tray table. So I offered him a hairband. He grunted, tied his hair up, put his head back on the tray table and then his dirty his ponytail was all over me.Ugh. And , I am left handed and couldn’t even do a xword or soduku puzzle. That was a VERY long flight. Wont make that mistake again. WIll select an aisle seat that allows me to put my arm into the aisle, or will consider a window on the left side of the plane. Probably the former, so I wont feel trapped if that happens again. It was truly disgusting. I was miserable. And it was a 4 hr flight!