In This Story UAL -1.49% DAL -1.70% Despite opening the year with a door plug blowout whose fallout reverberated throughout the industry, U.S. airlines had a pretty good year in the stock market. Bloomberg reports that the S&P Supercomposite Airlines index rose 57% this year, beating the S&P 500 by more than 30 percentage points — the biggest such gap in a decade. Suggested Reading Doctors are noticing an uptick in vaccine hesitancy, survey finds The Dow sinks 500 points as Nvidia and Tesla