Southwest Airlines says it has resolved all technical issues that plagued the carrier and its’s passengers Sunday. The Birmingham Airport Authority says flights have been running normal schedules today but it has been important for passengers to check for any flight changes with their airlines. Hartsfield Jackson Atlanta International Airport says Southwest’s systems came back online this morning around 7am. And there was very little operational impact in Atlanta. They say everything is back up and running and there are no lines at their check-in counters. Passengers waited in line for hours just to get their bags checked on Sunday. According to Southwest, a “technical issue” forced them to check in passengers manually, causing longer wait times. 500 flights were delayed on Sunday. Yesterday’s technical difficulties came just three months after a glitch at United Airlines that grounded 49-hundred scheduled flights.