Southwest Airlines passengers will no longer be guaranteed a free checked bag starting May 28. The airline, which has the most flights at Mitchell International Airport, will charge many of its customers $35 for a first checked bag and $45 for a second checked bag,

Still, much as Southwest likes to trace its origins to a single day in 1966, when its co-founders Herb Kelleher and Rollin King talked through the idea over drinks in a hotel bar, years from now people will be able to bookend that date with the day Southwest changed forever: May 28, 2025.