Several hundred times over the last decade, intruders have hopped fences, slipped past guardhouses, crashed their cars through gates or otherwise breached perimeter security at the nation's busiest airports -- sometimes even managing to climb aboard jets.
An Associated Press investigation found 268 perimeter breaches since 2004 at airports that together handle three-quarters of U.S. commercial passenger traffic. And that's an undercount, because two airports among the 31 that AP surveyed didn't have data for all years. Boston's Logan refused to release any information, citing security concerns.
At the San Diego International Airport, three accused intruders – all Marine recruits – were arrested between January 2013 and February 2014, according to Harbor Police documents obtained by NBC 7 Investigates under the California Public Record Act.
On Jan. 17, 2013, an unnamed recruit at the Marine Corps Recruit Depot, which neighbors the airport, drove a vehicle he had just stolen through an airport perimeter fence and into an operations area. He was turned over to Marine Corps Police Department officers, who took him to the hospital for medical treatment and a mental health exam.
Another Marine recruit, James Scott Winter, is accused of climbing a fence that separates the MCRD from the airport’s secure area. Harbor Police caught him, cited him and released him to Marine officials. The city attorney did not file charges in the case against Winter, who was 18 at the time.
The most recent incident happened on Feb. 1, 2014, when Marine Private Recruit Gabriel Garcia, then 20 years old, went around two security fences at the MCRD and trespassed into a restricted area of the airport, according to Harbor Police. He was cited for trespassing upon an airport operations area and transferred into military police custody.
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NBC 7 Investigates has not been able to reach Garcia or Winter, and we have not heard back from the Marine Corps.
Glen Winn, an aviation security consultant who helped with an audit of Lindbergh Field, told NBC 7 Investigates airport officials have placed a police car on the runway to catch intruders faster.
"The response times are a minute to any incident where somebody is trying to come over a fence, a la the Marines, you know, who try and break away from the bootcamp at MCRD, and that's mainly their problem,” said Winn.
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The biggest hazard, he said, is the risk of people getting run over by airplanes.
In other incidents across the country, one man tossed his bike over a fence and pedaled across a runway at Chicago O'Hare, stopping to knock on a terminal door. Another rammed a sports-utility vehicle through a security gate at Philadelphia International and sped down a runway as a plane was about to land.
At Los Angeles International, a mentally ill man hopped the fence eight times in less than a year -- twice reaching stairs that led to jets.
"Disturbing," Los Angeles Mayor Eric Garcetti said in response to the AP report during an "Ask the Mayor" segment on KNX-AM radio, noting that he wasn't surprised at his airport's 24 breaches because it is one of the largest in the nation.
"All it takes is one person who can get through and do something," he said.
Until now, few of the incidents have been publicly reported. Most involved intruders who wanted to take a shortcut, were lost, disoriented, drunk or mentally unstable but seemingly harmless. A few had knives, and another was caught with a loaded handgun.
None of the incidents involved a terrorist plot, according to airport officials.
The lapses nevertheless highlight gaps in airport security in a post-9/11 world where passengers inside terminals face rigorous screening and even unsuccessful plots -- such as the would-be shoe bomber -- have prompted new procedures.
"This might be the next vulnerable area for terrorists as it becomes harder to get the bomb on the plane through the checkpoint," said airport security expert Jeff Price.
Since the Sept. 11 attacks, hundreds of millions of dollars have been spent to upgrade perimeter fencing, cameras and detection technology. Many airports have dozens of miles of fencing, but not all of that is frequently patrolled or always in view of security cameras.
Airport officials insist perimeters are secure, and that an intruder being caught is proof their systems work. They declined to outline specific measures, other than to say they have layers that include fences, cameras and patrols. Employees are required to ask for proof of security clearance if a badge is not obvious.
Authorities said it is neither financially nor physically feasible to keep all intruders out.
"There is nothing that can't be penetrated," said LAX Police Chief Patrick Gannon, noting that even the White House has struggled with fence jumpers.
The AP's analysis was prompted by a breach last spring in which Yahya Abdi, 15, climbed a fence at Mineta San Jose International Airport, hoisted himself into a jet's wheel well and survived an almost six-hour flight to Hawaii. He had wanted to go to Africa to see his mother.
Afterward, an airport spokeswoman said breaches are more common than people realize.
Through public records requests, news archive searches and interviews, the AP created the most comprehensive public accounting of perimeter security breaches from January 2004 through January 2015 at the nation's 30 busiest airports, plus San Jose.
Among the findings:
- At least 44 times, intruders made it to runways, taxiways or to the gate area where planes park to refuel or load passengers. In seven cases, including Abdi's, they got onto jets.
- Seven international airports in four states accounted for more than half the breaches, although not all provided data for all years examined. San Francisco had the most, with 37. The others were in Philadelphia, Los Angeles, Las Vegas, San Jose, Miami and Tampa, Florida. The Port Authority of New York & New Jersey, which oversees Kennedy, LaGuardia and Newark airports, refused to provide a full accounting of perimeter breaches.
- Few airports revealed how long it took to apprehend suspects, saying this detail could show security vulnerabilities. Available information showed most arrests happened within 10 minutes. Several people went undetected for hours or never were caught.
Airports are responsible for securing perimeters, and the Transportation Security Administration reviews their security plans, conducts spot checks and can levy penalties. The agency said that from 2010 through 2014, it issued $277,155 in fines for 136 breaches.
Winn, who has done audits all over the world, said Lindbergh Field's security measures are probably top in the nation.
"Everything that they are doing is top of the line, and also the amount of equipment they have installed for security measures is the best," said Winn. "They really have gone all out to do that."
At a news conference called Thursday in response to AP's findings, the San Francisco airport spokesman said his facility had the most breaches because it disclosed everything, whether the breach was intentional or accidental. Spokesman Doug Yakel said the airport has beefed up security and that while its airfield is safe, "The goal is always zero" breaches.
U.S. Sen. Barbara Boxer, D-Calif., said she's been asking the TSA and airport officials since the San Jose case to "work together and resolve this alarming situation" and added: "Enough is enough, let's get it done."
Airports are supposed to inform the TSA of lapses, but the federal Government Accountability Office in 2009 found not all incidents were reported. In 2011, a TSA report counted 1,388 perimeter security breaches since 2001 at the 450 airports that TSA regulates.
The report isn't publicly available, and the agency declined to comment on AP's findings.
While many incidents were benign -- two trespassers were skateboarders -- other intruders posed greater dangers.
At the nation's busiest airport, Hartsfield-Jackson in Atlanta, three different intruders reached runways -- in 2007, 2012 and 2014. One was an aggravated assault suspect who came within 50 feet of a plane that had landed as he was pursued by police.
In Philadelphia, Kenneth Mazik sped onto the runway in March 2012 as a plane carrying 43 people was about to land. Air traffic controllers told 75 aircraft to circle and held 80 on the ground. He faced a rare federal prosecution, spent 16 months in prison and paid a $92,000 fine.
Among the intruders, Christopher McGrath stands out. Eight times between April 2012 and March 2013, police caught McGrath after he got over the fence at LAX on a mission to board a flight. He is now at a medical lockup in Missouri.
Security firms sold $650 million worth of fences, gates, sensors and cameras to airports in the decade following the 9/11 attacks, according to industry analyst John Hernandez, though he projects spending will drop.
Officials insist that no technology solution is foolproof. Outfit cameras with software designed to help identify intruders, and there may not be enough staff to monitor images. Airports have to weigh the potential threat of harm against the hefty cost of building elaborate defenses, experts said.
"It's one of those issues that I think until something really bad happens, not much is going to change," Price said.
