So far, Delta has cancelled 250 flights with 37 delays. Three flights out of Bush Intercontinental Airport have been cancelled already, so you will want to check your flight status before heading to the airport.
VIDEO: Delta Air Lines lifts ground stop on flights
The cancellations come a day after all flights were grounded, stirring tensions from Houston to London's Heathrow Airport.
Travelers in the UK say ticket booths were inundated as Delta employees had to issue paper tickets manually in some instances, taking more than an hour to meet with an agent.
The company says it will offer compensation to customers affected by the outage.
Delta will provide $200 in travel vouchers to travelers who experienced a delay of three or more hours, or whose flights were cancelled altogether.
Customers can go to the Delta Air Lines website for more information. All travel must be booked by August 8, 2017, the company says.