The supplied material reports that the U.S. government grounded all flights across the country because of what it described as “extraordinary circumstances.”
Limited information available
No supporting article, official statement, timing, duration or explanation for the grounding was provided. The available material also does not identify the agencies involved, the number of affected flights or the impact on passengers and airlines.
What remains unknown
Without additional verified information, the scope of the disruption and its effect on the U.S. aviation system cannot be assessed. Details about when flights were grounded, whether operations resumed and what prompted the action are unavailable.
Further official information would be needed to establish the event’s operational and business consequences.