Airline stocks are set up for a broad rally, led by American Airlines Group Inc. /zigman2/quotes/209207041/composite AAL -1.70% shares, after Deutsche Bank analyst Michael Linenberg said it was time to buy into the sector as COVID-19 cases, hospitalizations and vaccination rates are all trending in the right direction. He upgraded nine U.S.-based airlines to buy from hold. "As our upgrade is a sector-wide call, we are of the view that all of our names could see material upside from current levels," Linenberg wrote in a note to clients. Among the biggest premarket gainers, shares of American Airlines shot up 5.8%, JetBlue Airways Corp. /zigman2/quotes/207639051/composite JBLU -0.42% rallied 2.1%, Delta Air Lines Inc. /zigman2/quotes/200327741/composite DAL -1.24% rose 1.6%, Southwest Airlines Co. /zigman2/quotes/222210431/composite LU -1.23% hiked up 1.3% and Alaska Air Group Inc. /zigman2/quotes/200972303/composite ALK -0.97% tacked on 1.2%. Meanwhile, United Airlines Holdings Inc. /zigman2/quotes/205037281/composite UAL -1.10% edged up 0.3%, after an engine on Flight 328 blew apart midflight on Saturday. The U.S. Global Jets ETF /zigman2/quotes/207744796/composite JETS -1.01% climbed 1.4% ahead of the open, putting it on track to open at a one-year high, while futures /zigman2/quotes/209948968/delayed ES00 -0.38% for the S&P 500 /zigman2/quotes/210599714/realtime SPX -0.42% fell 0.8%.