however, 95% of an airport can be entered through its perimeter, its exterior fence. that's the largest part of the airport. >> the last federal audit of airport perimeters was done five years ago. the teenage stowaway is in a hawaiian hospital and will not face criminal charges. the president arrives in tokyo this morning. the first stop on a four nation asia-pacific visit. before leaving the u.s., mr. obama paid his respects to those who died in a washington state mudslide. here's abc's mary bruce. >> reporter: visiting the devastated area, president obama paid tribute to the human spirit of the community ravaged by last month's horrific mudslide. >> we have been inspired by the incredible way the community has come together. >> reporter: it was exactly one month ago when a torrent of mud came crashing through the tight-knit community of oso, washington. at least 41 people were killed in what was one of the worst mudslides in u.s. history.