WASHINGTON –– At least three small airplanes intruded into airspace over Camp David this weekend while President Bush was at the mountain retreat in Maryland, including one escorted to a nearby airport by fighter jets, the Secret Service said Sunday. Spokesman Jim Mackin said Secret Service agents questioned the pilots of all three planes – one of them an ultralight – determined the intrusions were inadvertent and took no action against them beyond referring the cases to the Federal Aviation Administration for possible administrative action. He said a fourth plane – also an ultralight – possibly was involved in a...