American Airlines grounded all of its flights across the US for an hour on Tuesday, saying it was experiencing technical issues as airlines gear up for the Christmas travel rush. The Federal Aviation Administration said in an advisory statement early on Tuesday morning that the airline's flights across the US were grounded.

American Airlines has grounded all flights on Christmas Eve morning, throwing travel plans for millions into disarray. What you need to know.

American Airlines has issued a travel alert on Tuesday to give passengers flexibility who were impacted by a technical issue on Christmas Eve. The airline said a “vendor technology issue” caused a temporary grounding of the airline’s flights on Tuesday morning during the busy holiday travel season.