The plane's wings, which contained its fuel, were sheared off, and there was no fire in the unoccupied law office that was struck. Videotape taken by firefighters showed the fuselage amid a mass of crumpled walls, furniture, glass and pink insulation. The plane hung above the sidewalk all night, but this morning workers pulled it inside with steel cables, then cut it up and removed it.
The building had no structural damage, and city officials said it would be open on Monday to all but the most directly affected tenants.
While jetliner passengers get their shoes swabbed for explosives, the ease with which a determined 15- year-old could crash a plane highlighted the very different security standards applied to the nation's general aviation system, as light planes and charter jets are known. Hanspeter Tschupp, who owns a flight school a few doors from the National Aviation school where the youth stole the plane, said almost all such schools allowed students to perform preflight checks on the tarmac without an instructor present.
"Of course, we won't be allowing that anymore," Mr. Tschupp said. "From now on, our instructors stay with the students the whole time."
Beyond the flight schools, however, most private planes are kept behind fences that are not secure at small airports. They are easy to break into — Mr. Tschupp said many manufacturers make only a few different keys for all models — and a terrorist would have little difficulty using a private plane as a weapon.
"They're easy to steal, and I haven't seen much increased security since Sept. 11," said Robert Baron, an aviation safety instructor who runs a consulting firm in Fort Lauderdale, Fla. "People really have no idea how vulnerable general aviation is right now."
The government clearly recognizes the potential threat, having shut down general aviation around large airports for three months after Sept. 11, lifting the restrictions last month. (Private flights near Reagan National Airport near Washington are still banned.) But there have been few changes in security surrounding general aviation, and industry officials say none are necessary.
Warren Morningstar, vice president of the Aircraft Owners and Pilots Association, the nation's largest civil aviation organization, noted that the damage done by the light plane was small and said there had never been a case of such a plane used for a terrorist act.
"In most general aviation accidents, you don't even get a fire," he said. "Of course there's a chance someone could do some damage, but you could say the same thing about a distraught individual who steals a bus or a truck."
He said smaller airports were already keeping a more watchful eye on people who fly and said many owners had begun securing their planes with items like propeller chains and throttle locks.
Nonetheless, most small planes are not secured in any way, and the teenager's ability to penetrate the airspace of one of the nation's most critical military bases dramatized the damage that a terrorist with explosives might have inflicted on MacDill. The Air Force sent two F-15 fighters from Homestead Air Reserve Base near Miami about six minutes into the flight, but they arrived after the crash.
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