SAN JOSE, Calif. (AP) — For all the tens of billions of dollars the nation has spent on screening passengers and their bags, few airports made a comparable investment to secure the airplanes. As the case of the San Jose stowaway shows, it did not take a sophisticated plan for a 15-year-old boy to spend about seven hours in what is supposed to be a secure area of Silicon Valley's main airport — much of it in a wheel well of the jet that took the teen to Hawaii. "No system is foolproof," San Jose International Airport aviation director Kim Aguirre said Wednesday.