American Airlines on Tuesday temporarily grounded all its flights in the US due to a technical issue in one of the busiest travel periods of the year, multiple reports said.


The US' Federal Aviation Administration (FAA) posted a nationwide groundstop order for all American flights at the request of the airline, an advisory said.


However, shortly after the airliner said that it has resumed service on Tuesday morning. American Airlines said that a 'technical issue' had delayed all of its flights in the US for around an hour. But the company started boarding flights again at around 8 am ET, according to CNN.


The outage comes at a time when people across America and Europe travel for Christmas and New Year vacation.  


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"An estimated timeframe has not been provided, but they're trying to fix it in the shortest possible time," the company had said in an earleir post on X.





There was no immediate response from the U.S. Federal Aviation Administration. Meanwhile, social media was full of the complaints from the travellers who complained of being stuck at the airport.


The outage came at a time when the airline is scheduled to have more than 3,300 domestic flights in the day, the report added. American Airlines' stock initially fell nearly 3 per cent in premarket trading, but rose 1 per cent following the resolution.


The latest outage comes months after American Airlines grounded all its flights due to an IT crash caused by a faulty software update after which several airlines were grounded in July.


Delta Airlines was among other operators that were impacted - with more than 42,000 flights were delayed and over 4,700 cancelled worldwide, according to BBC.