On Southwest Airlines, flyers can get organized boarding into groups to help them enter the aircraft smoothly and conveniently. Here, each group has a specific boarding order, which is dependent on the fare type and eligibility. Furthermore, knowing the Southwest Airlines boarding process helps travelers prepare for departure. In the section below, the points are mentioned. 
Preboarding: Eligible passengers needing assistance.
Group 1:A-List Preferred members and eligible fare passengers.
Group 2: Eligible Extra Legroom passengers.
Groups 3–4: Eligible Choice Preferred passengers.
Groups 5–8: Other passengers, depending on fare type and benefits.
For complete information about the boarding groups of Southwest Airlines, one can visit the online website of the airline or click the above link provided by Group Travel Airlines.
Read more: https://groupflight.odoo.com/blog/flights-4/how-does-the-southwest-airlines-boarding-process-work-55