Shares of Six Flags Entertainment Corp. rose 6% late Tuesday after the amusement-park operator reported a narrower-than-expected first-quarter loss and sales that beat Wall Street expectations. Six Flags said it lost $62 million, or 74 cents a share, in the quarter, compared with a loss of $58 million, or 63 cents a share, in the year-ago period. Sales rose to $129 million, from $100 million a year ago. Analysts polled by FactSet had expected a loss of 79 cents a share on sales of $119 million for the company. Six Flags is "firing on all cylinders" as it made "excellent progress" in growth initiatives that included new international licensing agreements and new park openings, Chief Executive Jim Reid-Anderson said in a statement. Shares of Six Flags ended the regular session down 2.7%.