道指开盘跌0.3%，标普500跌0.1%，纳指跌0.2%

Group 1 - United Airlines fell by 1.7%, American Airlines dropped by 1.1%, and Delta Airlines decreased by 1.5% due to a severe snowstorm that forced airlines to cancel flights nationwide [1] - Arcellx surged by 78.1% as Gilead Sciences announced it would acquire Arcellx at a price of $115 per share [1] - Novo Nordisk declined by 15.6% after its weight loss drug CagriSema showed less effective results compared to Eli Lilly's competing product, which saw an increase of 4.8% [1] - Domino's Pizza rose by 6.0% as its Q4 revenue exceeded expectations [1]