Southwest will start charging customers to check bags, launch basic economy tickets in a bid to drive up revenue.

Southwest Airlines is set to start charging customers for bags like every other airline, but when is that policy going to go into effect?

The airline industry—and passengers—are still getting acclimated to Southwest's "stunning reversal" earlier this month on its checked-bag policy, in which it ditched its allowance for two free bags and announced it would make customers pay for the honor.