A passenger activity monitoring system for an aircraft cabin, the system comprising: a first set of sensors (115, 305) disposed in seat bottoms of a plurality of passenger seats; a second set of sensors disposed in seat belts of a plurality of passenger seats; a crew display disposed in a galley area of an aircraft; processing circuitry operably coupled to the first set of sensors, the second set of sensors and the crew display, the processing circuitry configured to execute a plurality of machine-readable instructions stored to a non-transitory computer readable medium, wherein the instructions, when executed by the processing circuitry, cause the processing circuitry to receive, from the first set of sensors (115, 305), signals associated with the presence or absence of a passenger at a respective seat position, receive, from the second set of sensors, signals associated with a buckling status of a passenger seat belt at a respective seat position, receive, through assessing a passenger manifest, passenger assignment information as to the seating in a particular seat position for the plurality of passenger seats; store, in a non-transitory computer readable data store, real-time information about the presence or absence of a passenger at a respective seat position and the buckling status of a passenger seat belt at a respective seat position, wherein the stored information is uniquely associated with the respective passenger seats of the plurality of passenger seats, transmit, to the crew display, when the processing circuitry senses the presence of a passenger on the seat and senses a corresponding unbuckled status of a passenger seat belt, a notification of noncompliance based on the presence of a passenger at a respective seat position and the unbuckled status of a passenger seat belt at a respective seat position and cause to display, at the crew display, of the notification of noncompliance and an indication of a seat position associated with the notification of noncompliance, characterized in that the processing circuitry are further arranged in analysing the passenger manifest and transmit, to the crew display, when the processing circuitry senses the presence or absence of a passenger on the seat, a notification of non-compliance indicating whether the seat is occupied as set forth in the passenger manifest to identify a missing passenger or a passenger seated in an unassigned seat. a first set of sensors (115, 305) disposed in seat bottoms of a plurality of passenger seats; a second set of sensors disposed in seat belts of a plurality of passenger seats; a crew display disposed in a galley area of an aircraft; processing circuitry operably coupled to the first set of sensors, the second set of sensors and the crew display, the processing circuitry configured to execute a plurality of machine-readable instructions stored to a non-transitory computer readable medium, wherein the instructions, when executed by the processing circuitry, cause the processing circuitry to receive, from the first set of sensors (115, 305), signals associated with the presence or absence of a passenger at a respective seat position, receive, from the second set of sensors, signals associated with a buckling status of a passenger seat belt at a respective seat position, receive, through assessing a passenger manifest, passenger assignment information as to the seating in a particular seat position for the plurality of passenger seats; store, in a non-transitory computer readable data store, real-time information about the presence or absence of a passenger at a respective seat position and the buckling status of a passenger seat belt at a respective seat position, wherein the stored information is uniquely associated with the respective passenger seats of the plurality of passenger seats, transmit, to the crew display, when the processing circuitry senses the presence of a passenger on the seat and senses a corresponding unbuckled status of a passenger seat belt, a notification of noncompliance based on the presence of a passenger at a respective seat position and the unbuckled status of a passenger seat belt at a respective seat position and cause to display, at the crew display, of the notification of noncompliance and an indication of a seat position associated with the notification of noncompliance, characterized in that the processing circuitry are further arranged in analysing the passenger manifest and transmit, to the crew display, when the processing circuitry senses the presence or absence of a passenger on the seat, a notification of non-compliance indicating whether the seat is occupied as set forth in the passenger manifest to identify a missing passenger or a passenger seated in an unassigned seat.