A major airline has requested that all its flights be grounded. The Federal Aviation Administration in the US grounded all JetBlue flights following a request from the airline , the agency said on Tuesday morning. The ground stop impacted flights to all destinations, according to the advisory. It was not immediately clear why JetBlue requested the ground stop. However, operations have now been resumed after roughly an hour. "A brief system outage has been resolved and we have resumed operations,