Stocks jumped on Christmas Eve as the market pulled off back-to-back gains in the holiday week.The Dow Jones Industrials gained 390.08 points, the S&P 500 index hiked 65.97 points, and the NASDAQ grabbed 266.24 points.S&P 500 is up 1.8% this week, while the Dow has gained about 1%. The NASDAQ is up 2.3% this week.American Airlines briefly grounded all flights in the U.S. due to a technical issue on one of the busiest travel days.