Shares of air carriers were broadly lower Tuesday, even as travelers over the July 4 holiday weekend reached a pandemic-era high and as fewer flights were cancelled than in the days leading up to the weekend. The U.S. Global Jets ETF /zigman2/quotes/207744796/composite JETS +2.37% fell 0.8% in premarket trading, with the shares of all of its U.S.-based airline components that are trading losing ground. Among the more-active U.S. air carriers, shares of American Airlines Group Inc. /zigman2/quotes/209207041/composite AAL +3.08% dropped 2.1%, Delta Air Lines Inc. /zigman2/quotes/200327741/composite DAL +2.17% slid lost 1.1%, United Airlines Holdings Inc. /zigman2/quotes/205037281/composite UAL +2.35% shed 1.5%, JetBlue Airways Corp. /zigman2/quotes/207639051/composite JBLU +4.25% lost 0.8%, Spirit Airlines Inc. /zigman2/quotes/205782179/composite SAVE -0.04% sank 2.6% and Southwest Airlines Co. /zigman2/quotes/201071949/composite LUV +2.45% gave up 1.7%. Meanwhile, data provided by the U.S. Transportation Security Administration showed that the number of travelers going through TSA checkpoints fell to a one-month low of 2,081,119 on Monday, and was below last year's 2,160,147.