Delays continued Thursday morning at the Southwest Airlines gate at Logan Airport.
According to the airline "most systems are back online...following performance issues with multiple technology systems as a result of an outage."
Flights were grounded nationwide on Wednesday following a computer glitch.
While the computer system was back up this morning, there were still lines at the counter.
Southwest says they have cancelled more than 220 flights on Thursday and "continue to manage the flight disruptions created across our system."
The airline had to lower the number of flights departing Wednesday night in an effort to try and fully restore the system.
Customers couldn't buy tickets, check into flights, or check the flight status for hours.
More than 700 flights were cancelled across the country.
The airline tweeted on Wednesday night that they would be offering flexible accommodations for re-booking travel once the system was restored.