The Federal Aviation Administration (FAA) has taken the extraordinary measure of grounding all domestic flights across the United States. This unprecedented move is in response to [briefly mention the reason for the grounding, e.g. 'a significant safety concern' or 'a pressing national emergency']. The FAA has cited [provide a specific reason or regulation] as the basis for this decision. Airlines have been instructed to cease all scheduled flights until further notice, causing widespread disruption to travel plans. Passengers are advised to check with their airlines for more information and to expect significant delays or cancellations. The [channel/page/source] reports that [provide any additional relevant information or updates].