The reason I did not answer you sooner is because I have been on a trip to Las Vegas. I wanted to be sure before I answered & I can say 'for sure' Southwest Airlines DOES serve peanuts. I recieved peanuts both ways, going & returning. I have been served peanuts on another airline since 2000 but I can't remember for sure which one.
Velly intellesting... Thanks for the update. I wonder if the snack is chosen randomly, depends on route, or ????
I flew SW from Houston to LA, FWIW.