American Airlines will fly at full capacity — only 3 U.S. airlines have blocked the middle seat on domestic flights By: MarketWatch July 02, 2020 at 00:08 AM EDT One new safety measure: more lines open at security. Read More >> Related Stocks: Alaska Air Group Allegiant Travel Com American Airlines Gp Delta Air Lines Hawaiian Hlds Inc Jetblue Airways Corp Southwest Airlines Spirit Airlines Inc United Airlines Holdings Inc