We took our first flights on Southwest (2/20/2020) with our children who have both peanut and tree-nut allergies, as we found this the best option for our travels to and from Hawaii. We are thankful Southwest has stopped serving peanuts as we previously chose not to fly with them. We chose Southwest for these flights (3 in total: Oakland to Honolulu, Honolulu to Maui & Maui to Oakland) because the partner airline (Hawaiian) for our airline of choice (JetBlue) serves tree-nuts.
For all three flights, we were allowed to preload to wipe seats, no nut products were served and an announcement was made to the entire plane (during the safety demonstration) alerting passengers of passengers with severe nut allergies on board and requesting they not open or consume nuts.
Note that I requested these announcements and for 2 of the flights, this request was graciously received but for one flight, the attendant did not understand what “type of announcement” I was asking for. Once I explained, she said she had to ask the pilots for permission, which she did, and to which they obliged. I was shocked that this request was met with surprise, but was happy that they ended up making it. The flight attendant was kind after getting it approved and announced.
Based on these experiences, we will choose to fly Southwest again when our other airline of choice.