gahsoon/E+ via Getty Images An outage for a key computer system operated by the Federal Aviation Administration caused flights across the US to be grounded on Wednesday. The agency released a notice at 4:18 AM ET that the Notice to Air Missions (NOTAM) system, a system that updates pilots of potential hazards and changes along flight routes, had failed. According to NBC News, this outage has grounded all flights nationwide on Wednesday morning. The update indicated there is no timeline as to when service will be restored. “The FAA is working to restore its Notice to Air Missions System. We are performing final validation checks and reloading the system now. Operations across the National Airspace System are affected. We will provide frequent updates as we make progress,” an FAA update released at 6:30 AM ET stated. Airline stocks: Delta Air Lines (NYSE:DAL), American Airlines (NASDAQ:AAL), , United Airlines (NASDAQ:UAL), Southwest Airlines (NYSE:LUV), Spirit Airlines (SAVE), Alaska Airlines (ALK), JetBlue Airways (JBLU), Sun Country (SNCY), Frontier Air Group (ULCC), Hawaiian Airlines (HA), Skywest (SKYW), Allegiant (ALGT), Mesa Air Group (MESA), Air Canada (OTCQX:ACDVF). This is a developing story and will be updated as the situation progresses.