Missile Threat Is Bringing Stricter Rules for Airports
Federal authorities will order major security upgrades at several of nation's largest airports after inspections show passenger planes are vulnerable to attack by terrorists using shoulder-fired missiles; inspections are being conducted by task force created by Bush administration in response to last year's attempt to shoot down Israeli plane on takeoff from airport in Kenya by terrorists linked to Al Qaeda; officials decline to identify airports in question; National Guard troops were deployed earlier in week to Los Angeles International Airport, and spokesman for Port Authority of New York and New Jersey Pasquale DiFulco says area airports are aware of missile threat and are responding accordingly, but declines to give details; photos (M)
