A seat arrangement for use in a transportation vehicle such as an aircraft, the seat arrangement comprising: a first seat including a seat back and a seat cushion; a second seat, wherein the first seat comprises a sensor array comprising: a passenger presence sensor operable for determining if a passenger is present in or absent from the second seat; a seat back position sensor operable for determining if a seat back of the first seat is in a reclined or upright position; and a controller in communication with the passenger presence sensor and the seat back position sensor operable for receiving passenger presence information from the passenger presence sensor and seat back position information from the seat back position sensor, characterized in that the controller is further configured to determine passenger presence in or absence from the second seat based on a comparison of a measured distance to a passenger receiving portion of the second seat when unoccupied to a measured distance to a passenger present in the second seat, wherein when a given threshold is exceeded a passenger is deemed present in the second seat, and the controller further configured to communicate the passenger presence information to a crew member device; wherein the passenger presence sensor and the seat back position sensor are together provided in a housing located in the seat back of the first seat and the first seat is positioned in a row in front of the second seat such that the passenger presence sensor housed in the first seat is directed towards the second seat to determine if a passenger is present in or absent from the second seat. a first seat including a seat back and a seat cushion; a second seat, wherein the first seat comprises a sensor array comprising: a passenger presence sensor operable for determining if a passenger is present in or absent from the second seat; a seat back position sensor operable for determining if a seat back of the first seat is in a reclined or upright position; and a controller in communication with the passenger presence sensor and the seat back position sensor operable for receiving passenger presence information from the passenger presence sensor and seat back position information from the seat back position sensor, characterized in that the controller is further configured to determine passenger presence in or absence from the second seat based on a comparison of a measured distance to a passenger receiving portion of the second seat when unoccupied to a measured distance to a passenger present in the second seat, wherein when a given threshold is exceeded a passenger is deemed present in the second seat, and the controller further configured to communicate the passenger presence information to a crew member device; wherein the passenger presence sensor and the seat back position sensor are together provided in a housing located in the seat back of the first seat and the first seat is positioned in a row in front of the second seat such that the passenger presence sensor housed in the first seat is directed towards the second seat to determine if a passenger is present in or absent from the second seat. a passenger presence sensor operable for determining if a passenger is present in or absent from the second seat; a seat back position sensor operable for determining if a seat back of the first seat is in a reclined or upright position; and a controller in communication with the passenger presence sensor and the seat back position sensor operable for receiving passenger presence information from the passenger presence sensor and seat back position information from the seat back position sensor, characterized in that the controller is further configured to determine passenger presence in or absence from the second seat based on a comparison of a measured distance to a passenger receiving portion of the second seat when unoccupied to a measured distance to a passenger present in the second seat, wherein when a given threshold is exceeded a passenger is deemed present in the second seat, and the controller further configured to communicate the passenger presence information to a crew member device; wherein the passenger presence sensor and the seat back position sensor are together provided in a housing located in the seat back of the first seat and the first seat is positioned in a row in front of the second seat such that the passenger presence sensor housed in the first seat is directed towards the second seat to determine if a passenger is present in or absent from the second seat.