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Bridgeton, MO (KMOV) -- Security changes are underway at Lambert Airport after a homeless man made his way onto a plane Wednesday morning and fell asleep.

Two security guards have been suspended pending the security firm's own investigation in to the incident.

The man slipped past security guards at a perimeter check point while guards were inspecting a vehicle.

He was found sleeping on a regional jet that was being worked on.

No passengers were onboard at the time.

The Lambert police chief is calling this incident a "hiccup" in the system.

No charges are expected against the man until next week.