The Obama administration has reached a patchwork accord with congressional leaders to end a 13-day partial shutdown of the Federal Aviation Administration, Senate Majority Leader Harry Reid said Thursday. The agreement signals an end, at least for a few weeks, to a standoff over policy issues that had left 4,000 agency employees out of work, idled tens of thousands of workers at hundreds of airport construction projects, and cost the federal government more than $350 million in lost taxes on airline tickets.