The S&P 500′s airline index, which includes American Airlines and other major carriers, has jumped nearly 25% so far in 2021 as vaccine distribution ramps up and begins to clear the way for a full economic recovery. The gains are outpacing the broader S&P 500′s 3% rise, marking a sharp reversal from last year. In 2020 airlines lost up to half their values as the S&P 500 powered through the pandemic to a solid gain.