A technology failure briefly grounded every American Airlines flight across the United States on Tuesday. This affected all American Airlines flights nationwide. Instead, an IT system failure within American Airlines triggered the disruption. By The NumbersMetric Detail Scope of ground stop Nationwide — all American Airlines U.S. departures Cause Internal IT system failure FAA action Ground stop advisory issued Status Flights resumed after issue resolved American Airlines fleet size Approximately 960 mainline aircraft Daily AA flights (approx.) If you plan to fly American Airlines in the next few days, check your flight status more often than usual.