Our 6-week old son got miles from his DL flight when we brought him
home at age 2 weeks and he was in a paid infant/child class fare.

Does anyone know if this applies to Southwest? Our neighbors just returned from a 4 week trip to Chicago, PHL and Florida and they had nothing but good things to say about WN and how they were treated with their 6 month old son. I guess they were surprised that WN still did preboarding for pax with infants.