American Airlines grounds all US flights

American Airlines has grounded all flights in the US due to an unspecified technical issue.The Federal Aviation Agency said: "American Airlines is reporting a technical issue and has requested a nationwide ground stop." The airline has not said why it was stopping all flights but Christmas Eve travellers face the possibility of significant disruption."An estimated timeframe has not been provided, but they're trying to fix it in the shortest possible time," the airline said on social media.In a preliminary s ...