Commercial Fixed Wing
Flight Attendant Current
Situational Awareness; Confusion
Deviation / Discrepancy - Procedural Security; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Human Factors; Procedure
Plane landed from ZZZ approximately 2 1/2 hours prior to our check in time. Crew swiped in with gate agent and preceded to plane. Upon arrival onto aircraft; crew noticed that there was a large bag still in overhead. Plane had not been cleaned; but had been catered. Cockpit notified Ground and when cleaners showed up; I asked them if they were going to do a cabin security search (I have been told they are now trained to do these searches instead of TSA/security personnel). They were a bit [lost] and then as if being prompted said yes; we had already stowed our bags so I asked if they needed for us to step back off plane with our bags; they said no it's ok; but I asked my crew to please gather their bags and step off so a correct safety sweep could be done. As we stepped back off plane; the gate agent came down and removed bag. I asked what she was going to do with it and she said send it to baggage claim. SOP was not followed with this flight and I was taken back by the lack of concern by our gate agent and our ground crew.
Flight attendant reported an unclaimed bag was discovered when boarding the aircraft and security procedure was not followed.