 No more ground stops are in place, but for a while today, major airlines like United, Delta, American, Spirit, and Sun Country were holding flights at their gates while systems were down. That has impacted the entire day of travel. Nathan heading to Nashville says it was a mess. We did hear them say they were going to do some manual boarding and try to do it manually to get everybody checked in. Two airlines that specifically were not impacted, Southwest and JetBlue. Alex Stone, ABC News. More than 2,000 flights canceled in the U.S. This is ABC.