Times have changed, and one of the pillars of its business model -- "bags fly free" -- has finally fallen by the wayside.

Southwest offered strong flexibility and two free checked bags with every ticket, while JetBlue offered an enhanced onboard experience compared to its low-cost and legacy competitors. Meanwhile, ...

The era of free checked bags at Southwest is coming to a close, as May 27 marks the final day the low-cost carrier is offering free checked bags for all its passengers.