A powerful winter storm has caused widespread travel chaos across the Northeastern United States, particularly impacting air travel during the post-holiday period. Over 1,800 flights were cancelled nationwide, with New York's major airports (JFK, LaGuardia, Newark) being the hardest hit. States like New York and New Jersey have declared states of emergency, urging residents to avoid travel due to hazardous conditions including heavy snow, ice, and reduced visibility. Airlines are waiving change fees for affected passengers.