Airlines stocks fell across the board in premarket trade Wednesday, after the Federal Aviation Administration said a computer outage had led to all U.S. fights being grounded.
The agency said on its website that its "Notice to Air Missions" system has been activated "to address the equipment outage issues for the U.S. NOTAM system." A NOTAM is a notice for workers engaged in flight operations.
There was no indication of when service might be restored.
Southwest Airlines JCo. $(LUV)$ led the decliners, falling 2.79%. American Airlines Group Inc. $(AAL)$ was down 1.32%, United Airlines Holdings Inc. $(UAL)$ was down 1.09% and Delta Air Lines Inc. $(DAL)$ was down 0.87%. The U.S. Global Jets ETF was down 0.94% and has fallen 14% in the last 12 months, while the S&P 500 has fallen 17%.