articleThe Brief The FAA ordered a full ground stop for American Airlines on Tuesday evening. The Federal Aviation Administration issued a full ground stop Tuesday evening for all American Airlines flights still on the ground. Big picture view:The ground stop was attributed to an IT outage, according to an FAA advisory. What they're saying:"We put a temporary ground stop in place while our teams worked to resolve the issue. The Source: Information for this article was taken from American Airlines and the FAA.