A system comprising: a plurality of trolley bays including at least one extended bay, the extended bay having a front side, a rear side, and at least one side wall, the extended bay configured to removably stow a trolley at the rear adjacent to the rear side and a trolley at the front adjacent to the front side; a turnbutton having a latched state and an unlatched state coupled to at least one of the plurality the trolley bays, the turnbutton in the latched state secures the trolley or engages a retainer element to secure the trolley on one of the trolley bays; a bay door comprising a latch indicator window ; and an indicator assembly coupled to the bay door configured to contact the turnbutton when the bay door is closed and indicate whether the turnbutton is in the latched stated or unlatched state, comprising: a flag assembly comprising: a latch signal , configured to be visible through the latch indicator window when the turnbutton is in the latched state; and an unlatch signal , configured to be visible through the latch indicator window when the turnbutton is in the unlatched state; and a wedge coupled to the flag assembly, wherein the wedge contacts the turnbutton when the turnbutton is in the unlatched state, wherein upon contact the flag assembly is translated so that the unlatch signal is visible through the latch indicator window. a plurality of trolley bays including at least one extended bay, the extended bay having a front side, a rear side, and at least one side wall, the extended bay configured to removably stow a trolley at the rear adjacent to the rear side and a trolley at the front adjacent to the front side; a turnbutton having a latched state and an unlatched state coupled to at least one of the plurality the trolley bays, the turnbutton in the latched state secures the trolley or engages a retainer element to secure the trolley on one of the trolley bays; a bay door comprising a latch indicator window ; and an indicator assembly coupled to the bay door configured to contact the turnbutton when the bay door is closed and indicate whether the turnbutton is in the latched stated or unlatched state, comprising: a flag assembly comprising: a latch signal , configured to be visible through the latch indicator window when the turnbutton is in the latched state; and an unlatch signal , configured to be visible through the latch indicator window when the turnbutton is in the unlatched state; and a wedge coupled to the flag assembly, wherein the wedge contacts the turnbutton when the turnbutton is in the unlatched state, wherein upon contact the flag assembly is translated so that the unlatch signal is visible through the latch indicator window. a flag assembly comprising: a latch signal , configured to be visible through the latch indicator window when the turnbutton is in the latched state; and an unlatch signal , configured to be visible through the latch indicator window when the turnbutton is in the unlatched state; and a latch signal , configured to be visible through the latch indicator window when the turnbutton is in the latched state; and an unlatch signal , configured to be visible through the latch indicator window when the turnbutton is in the unlatched state; and a wedge coupled to the flag assembly, wherein the wedge contacts the turnbutton when the turnbutton is in the unlatched state, wherein upon contact the flag assembly is translated so that the unlatch signal is visible through the latch indicator window. <EOS>