A tray table arm (128, 228, 328, 428) comprising: a pivot mount configured to receive a shaft (172, 372) of a tray table body (114, 214, 314) so as to permit rotation of the tray table body (114, 214, 314) relative to the tray table arm (128, 228, 328, 428); a stowed configuration stopper (168, 268, 369); a deployed configuration stopper (170, 270, 370), the stowed configuration stopper (168, 268, 369) and the deployed configuration stopper (170, 270, 370) defining ends of a path of travel, the stowed configuration stopper (168, 268, 369) and the deployed configuration stopper (170, 271, 370) disposed such that the path of travel is sized to permit travel therein of a rotation guide structure (176, 276, 376) coupled with the tray table body (114, 214, 314) such that (i) rotation of the tray table body (114, 214, 314) is obstructed when travel of the rotation guide structure (176, 276, 376) is obstructed and (ii) rotation of the tray table body (114, 214, 314) is allowed when travel of the rotation guide structure (176, 276, 376) is allowed, the stowed configuration stopper (168, 268, 369) is configured to block travel of the rotation guide structure (176, 276, 376) past one end along the path of travel so as to prevent rotation of the tray table body (114, 214, 314) past a stowed configuration of the tray table body (114, 214, 314), and the deployed configuration stopper (170, 270, 370) configured to block travel of the rotation guide structure (176, 276, 376) past another end along the path of travel so as to prevent rotation of the tray table body (114, 214, 314) past a deployed configuration of the tray table body (114, 214, 314); and a constraint release feature (166, 266, 366) configured to, in response to exertion of a force exceeding a threshold upon the tray table body (114, 214, 314), modify at least one of a position, structure, or configuration of the stowed configuration stopper (168, 268, 369) so as to permit travel of the rotation guide structure (176, 276, 376) past the one end along the path of travel so as to permit rotation of the tray table body (114, 214, 314) past the stowed configuration (168, 268, 369) of the tray table body; characterised in that each of the stowed configuration stopper (168, 268, 368) and the deployed configuration stopper (170, 270, 370) comprises a set screw such that: the set screw of the stowed configuration stopper (168, 268, 369) is configured to be tightened or loosened to change a resting position of the rotation guide structure and correspondingly change an orientation of the tray table body (114, 214, 314) in the stowed configuration; the set screw of the deployed configuration stopper (170, 270, 370) is configured to be adjusted to correspondingly adjust orientation of the tray table body (114,214, 314) in the deployed configuration. a pivot mount configured to receive a shaft (172, 372) of a tray table body (114, 214, 314) so as to permit rotation of the tray table body (114, 214, 314) relative to the tray table arm (128, 228, 328, 428); a stowed configuration stopper (168, 268, 369); a deployed configuration stopper (170, 270, 370), the stowed configuration stopper (168, 268, 369) and the deployed configuration stopper (170, 270, 370) defining ends of a path of travel, the stowed configuration stopper (168, 268, 369) and the deployed configuration stopper (170, 271, 370) disposed such that the path of travel is sized to permit travel therein of a rotation guide structure (176, 276, 376) coupled with the tray table body (114, 214, 314) such that (i) rotation of the tray table body (114, 214, 314) is obstructed when travel of the rotation guide structure (176, 276, 376) is obstructed and (ii) rotation of the tray table body (114, 214, 314) is allowed when travel of the rotation guide structure (176, 276, 376) is allowed, the stowed configuration stopper (168, 268, 369) is configured to block travel of the rotation guide structure (176, 276, 376) past one end along the path of travel so as to prevent rotation of the tray table body (114, 214, 314) past a stowed configuration of the tray table body (114, 214, 314), and the deployed configuration stopper (170, 270, 370) configured to block travel of the rotation guide structure (176, 276, 376) past another end along the path of travel so as to prevent rotation of the tray table body (114, 214, 314) past a deployed configuration of the tray table body (114, 214, 314); and a constraint release feature (166, 266, 366) configured to, in response to exertion of a force exceeding a threshold upon the tray table body (114, 214, 314), modify at least one of a position, structure, or configuration of the stowed configuration stopper (168, 268, 369) so as to permit travel of the rotation guide structure (176, 276, 376) past the one end along the path of travel so as to permit rotation of the tray table body (114, 214, 314) past the stowed configuration (168, 268, 369) of the tray table body; characterised in that each of the stowed configuration stopper (168, 268, 368) and the deployed configuration stopper (170, 270, 370) comprises a set screw such that: the set screw of the stowed configuration stopper (168, 268, 369) is configured to be tightened or loosened to change a resting position of the rotation guide structure and correspondingly change an orientation of the tray table body (114, 214, 314) in the stowed configuration; the set screw of the deployed configuration stopper (170, 270, 370) is configured to be adjusted to correspondingly adjust orientation of the tray table body (114,214, 314) in the deployed configuration.