强风暴席卷美国：航空交通瘫痪，近2亿人受影响

Group 1 - A severe storm impacted a large portion of the United States on March 15, affecting nearly 200 million people, with over 1.1 million under snowstorm warnings [1] - The storm caused significant disruptions in air travel, with over 15,000 flights canceled or delayed on March 16, and several airports implementing temporary ground stops [1] - The National Weather Service issued warnings for continued severe weather, including heavy snow and strong winds, particularly affecting the Midwest, North, and Northeast regions [1][2] Group 2 - The extreme weather coincided with a busy travel period due to spring break, leading to increased passenger traffic at airports [2] - Staffing shortages at airport security, caused by funding issues within the Department of Homeland Security, resulted in longer wait times for travelers [2]