Abstract: A tray for accommodating eating, reading, and writing activities for a passenger seated in a transport vehicle, and a seat cover supporting the tray on a seat back of a seat of the transport vehicle. The seat cover has a plurality of connectors enabling the tray to be manually connected to the seat cover and thereby supported. The tray has a flat floor, a peripheral wall, and two receptacles for supporting cups or bowls. Two hooks project forwardly from the tray, for engaging two of the connectors. Two support struts are pivotally journalled respectively to right and left sides of the tray. The free ends of the two struts are received in two of four connectors of the seat cover. Each of these four connectors has a socket for receiving a strut. Four different ways of connecting the tray to the seat cover are thus provided, each one way resulting in inclination of the tray relative to the seat cover which differs from the other possible inclinations.