Dish Network is targeting a summer debut for its Internet-TV service in the U.S., according to people familiar with the matter. Dish is telling programmers, including Comcast’s NBCUniversal, that a late summer release date is possible, said the people, who asked not to be named because the negotiations are private. Dish, the second-largest U.S. satellite-TV operator, already signed up Walt Disney Co. for the service last month. A&E Television Networks LLC, Time Warner Inc.’s Turner Broadcasting and CBS Corp. also have spoken with Dish about Internet-TV rights, several people said. Charlie Ergen’s Dish is trying to be the first to sell a full package of live-streaming channels — similar to those offered with a cable subscription — over the Web. An Internet-based TV package would give consumers a new option beyond cable, satellite and phone companies.