What does Group C mean on Southwest Airlines? Southwest Airlines boarding works differently from airlines with assigned seats, using a lineup based on your boarding group and position number. The Southwest Airlines Boarding Groups include A, B, and C, with Group C being the last and final boarding group, which means travelers in this group can board after Groups A and B, and they have little choice in selecting the seats. Read more: https://www.airlinesgrouptravel.com/blog/southwest-airlines-boarding-groups #southwestairlinesbordinggroups #southwestboardinggroups