Two planes came within 300 feet of each other last week when a controller at Los Angeles International Airport mistakenly cleared three planes for the same runway.

US Air Force fighter jets were scrambled today to intercept a privately owned plane that flew too close to the White House.

The first-ever grounding of all flights in the United States will remain in effect until at least noon EDT Wednesday due to security concerns following Tuesday's hijackings of airliners that were then crashed into buildings, the Federal Aviation Administration said.