(FOXNEWS) — American Airlines says its systems have been fully restored after an outage grounded flights nationwide, but continued delays and cancellations are expected.

Flights across the U.S. were halted Tuesday when the main reservations system went down. Thousands of passengers were stranded at airports and on airplanes.

In a statement, the company said that if passengers must travel Tuesday and are already at the airport, they can rebook on another airline. If not yet at the airport, customers can rebook through American Airlines reservations or through another carrier and American will honor the fare difference.

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