Missy Ryan Ashley Halsey Iii The Washington Post

Federal air marshals have for years been quietly monitoring small numbers of U.S. air passengers and reporting on in-flight behavior considered suspicious, even if those individuals have no known terrorism links, the Transportation Security Administration said on Sunday.

Federal air marshals have for years been quietly monitoring small numbers of U.S. air passengers and reporting on in-flight behavior considered suspicious, even if those individuals have no known terrorism links, the Transportation Security Administration said on Sunday.