Stocks edged higher on Wall Street, led by big gains in travel-related companies as energy prices drop. Cruise companies and airlines were among the biggest gainers in the early going Wednesday. The market is on track to post a modest gain in this holiday-shortened week ahead of the Thanksgiving holiday in the U.S. Thursday. The S&P 500 was up 0.2%, the Dow was up 76 points, and the Nasdaq composite rose 0.3%. Crude oil prices sank more than 4% after OPEC said it would postpone its latest conference to next week. Treasury prices were relatively steady.