Booked a flight from SLC to LAS wanting to try Southwest since they support USA as an all Boeing fleet. Booked the flight based on flying on a 737 Max. Friday morning, day of the flight the plane was switched to a 737-800, first strike. The plane left Baltimore 1 hour, 45 minutes late, second strike. Reviewing the route history, seems it's a chronic, late route which apparently nothing has been done to correct that. Plane showed up and we start to board (pre-board) and a few groups obviously needed the extra time. Then multiple groups of people (2-4 person groups) started pre-boarding, mostly adults and looked perfectly healthy. Seems they learned to work the system. Boarded in group A36 to A40 and no shock, the first several rows were filled. After picking my aisle seat, and waiting in the plane with no A/C, the right engine needed help starting at the gate (huffer). Add another 15 minutes to the already late flight, perfect. The attendants absolutely didn't care and were standing up front chatting with the gate agent before the door was closed and everyone was seated, unprofessional. Engines starting and 10 minutes into the flight, an announcement, NO drink or snack service... Arrived in Las Vegas 2+ hours late... First time on Southwest and it's my last time. Southwest is better than Sprit, Frontier and Allegiant ( extremely low bar) but I'm sticking with the big 3 from now on... Great job Southwest, you should be proud...