I SAID I AM JUST CURIOUS
Good for you.
It is none of your business the security procedures used at your Airport. There are many obvious ones like locks on doors,multiple cameras covering most public spaces.
Humans as in fellow employees watching their particular part of the Airport. Your tag has obvious clues on it as to where you are allowed to go.
Some security is obvious like a Uniformed Guard or that camera over there.
Hidden cameras, plains clothes security, Sky Marshall, undercover police, Customs etc just wandering around.
Passenger count is very important. It is checked in many ways is all you NEED to know. The plane does not go until all boarding passes,/passenger heads are accounted for.
It has happened the entire plane is cleared. The plane searched and then passengers loaded again checking each ticket pass. Security will want to know why YOU are not getting back on.
How long do you think it will take them to find out you did not have a ticket?
As this delay can cost the Airline $100,000 or more in costs to rebook connecting passengers. New Crew, possibly meals it is not something they do with joy. The gate crew responsible for the Airplane does not want to account for their letting an unticketed person onto the plane. It could be their job at risk. Their security clearance.
The security services have more than enough to deal with. They really do not play nice with newbies wanting to play games testing the security procedures.Mistakes happen you go through the wrong door and get locked in or out of some place. They will review the cameras to verify your tale. Review the security logs of the locks and other sensors. You really do not want to be under constant observation for weeks after an incident. It is uncomfortable for your Boss and they may just decide that you are not worth the hassle and show you the exit.
So do you think a free plane ride is worth losing your job. a fine, time in jail?
If I tell you the secret ways to do it I am telling everyone else too. I like my high security clearance.Part of keeping it was dealing with those that did not belong. Usually by just having security escort them from my area of responsibility. I DID NOT CARE what happened to the individual after out of my area.I was too busy trying to see if they did something, left something behind or whatever.
Suggest your first few weeks on the job concentrate on YOUR place of employment and their particular security rules. Over time you will learn and see the security procedures of the next area of the Airport.
As issues change from day to day you can expect security procedures to change frequently.
It was harmless pranks in the past. It is not anymore. Your choice to play games testing security procedures.
Just accept the other side does not play nice with intruders when caught.
A plane delayed costs about $1000 per minute NO EMPLOYEE wants to be responsible for this and they work to avoid it as much as they can.
Needing to evacuate a section of the Airport to do a security sweep to check for some other stow away your hidden luggage can easily be $1,000,000 in expenses to the various groups at the Airport.