 Shares of Six Flags Entertainment Corp. SIX, -3.92 dove 4.7 in premarket trading Thursday, after the theme park operator reported third-quarter profit and revenue that missed expectations, as rising ticket prices led to a drop in attendance, which more than offset an increase in guest spending. Net income fell to 115.8 million, or 1.39 a share, from 157.2 million, or 1.83 a share, in the year-ago period. 