Dallas-based Southwest's traffic — the number of miles that passengers fly — grew by double-digit percentages from 2004 through 2006. It hasn't approached that kind of growth since, however, except in the year that it added AirTran. Last year, traffic grew just 1.4 percent, the second-smallest gain in this century.
Its shares rose 87 cents, or 3.2 percent, to close at $27.73 after hitting an all-time high of $27.83 earlier in the session. They have gained 47 percent in 2014.