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MIAMI (CBSMiami/AP) — Intruders have breached fences and gates surrounding Florida’s four busiest airports almost 40 times since 2004.

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An Associated Press investigation found 14 incidents at Miami’s airport, 13 at Tampa, seven at Orlando International and three at Fort Lauderdale-Hollywood International.

The breaches were among at least 268 at the nation’s busiest airports between January 2004 and January 2015. None involved a terrorist plot.

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In 19 cases, security nabbed a person who scrambled over or under a fence. Last year at Orlando, a man climbed into a jet’s wheel well and stayed for hours. In 2010 at Fort Lauderdale, a man boarded an empty jet after stabbing a plumber.

Airports say breaches are relatively rare. Security measures include fences, cameras and patrols, but there are gaps.

(TM and © Copyright 2015 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2015 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)

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