U.S. Defense Secretary Leon Panetta says plans to set up a no-fly zone over parts of Syria are "not on the front burner." In an interview with The Associated Press on Monday, Panetta said he is confident the U.S. could successfully enforce a no-fly zone over Syria, but doing so would require a "major, major policy decision" that has not yet been made. "We have planned for a number of contingencies that could take place and one of those possible contingencies is developing a no-fly zone. But we've also pointed out difficulties in being able to implement that," Panetta said. "It's not on the front burner as far as I know." U.S. Secretary of State Hillary Rodham Clinton said recently that Washington and Turkey are discussing a range of steps, including a no-fly zone over some parts of Syria.