The FAA has lifted a rare nationwide ground stop that halted flights across the U.S. due to a significant air traffic control communication issue. The ground stop, which lasted over four hours, led to the cancellation of nearly 5,000 flights and widespread delays, stranding thousands of travelers. Although flights can resume, travelers are advised to expect ongoing interruptions as airlines work to manage the backlog. The White House has indicated there is no evidence of malicious intent behind the disruption, while investigations continue into whether outdated technology or recent software updates may have contributed to the chaos.