Over the holidays, thousands of passengers were left stranded or delayed when Southwest Airline’s outdated re-booking software broke down. Who can be held accountable, and why don’t airlines invest more in their own infrastructure?  Guest: Heather Tal Murphy, business and technology reporter for Slate. Host: Mary C. Curtis If you enjoy this show, please consider signing up for Slate Plus. Slate Plus members get benefits like zero ads on any Slate podcast, bonus episodes of shows like Slow Burn and Dear Prudence—and you’ll be supporting the work we do here on What Next TBD. Sign up now at slate.com/whatnextplus to help support our work. Learn more about your ad choices. Visit megaphone.fm/adchoices