S&P 500 opens at record after holidays, but airline shares slide following Covid cancellations
U.S. stock indexes rose Monday as markets reopened after the Christmas holiday and investors assessed the spread of the omicron Covid-19 variant.The Dow Jones Industrial Average gained about 115 points, or 0.3%. The S&P 500 added 0.4% and the Nasdaq Composite ticked up 0.4%.Airline stocks fell after a holiday weekend that saw thousands of flights canceled due to Covid-related issues. The rampant spread of the omicron variant led to a staffing shortage at a time when airlines were looking to ramp