Call centers at Southwest Airlines Co. have been swamped by customers with questions and complaints about its revamped frequent-flier program.
On Thursday travelers were sorting out the new rules that reward them for how much they spend with Southwest rather than how many flights they take.
The introduction of the new Rapid Rewards program was fouled by technology glitches last week. Customers couldn’t see their accounts or book free flights.
Those problems have mostly been solved, said Southwest spokesman Chris Mainz, but he....