Wal-Mart Stores, Bentonville, Ark.--with plans to sell airline tickets, car rental bookings and hotel reservations over the Web--hired Leapnet to handle the travel services section of its new Web site. Wal-Mart's Sam's Club subsidiary also retained Leapnet, Chicago, as lead developer for its first e-commerce site, which is expected to have a slightly more upscale bent than the primary Wal-Mart site. Frederick A. Smith, chairman-CEO of Leapnet and president of Leapnet parent Quantum Leap Communications, said his company will be working both on strategy and development of the two Wal-Mart online selling ventures. Grey Interactive, New York, has been building the major portion of the Wal-Mart site. Company officials yesterday revealed details of the sites, expected to be launched after the first of the new year, at their annual meeting.