the manner of fig9 with the apparatus on flooring 114 a cargo load 116 which may be transported and handled by apparatus 118 such as disclosed in my u s pat no 4 432 689 is lowered via hook 112 through cargo hatch 23 onto top tray 40 as illustrated in fig3 after separating the cargo load 116 from the cargo handler 118 push cylinders 72 74 and 76 are simultaneously actuated for extending top tray 40 and push bar 80 along with the cargo load 116 thereon until the upper tray 40 is positioned substantially coextensive with and is superimposed over the middle tray 30 as shown in fig4 with the cargo 116 having reached its destination site in wing 15 the middle and upper trays 30 and 40 are withdrawn concomitantly this is effected by first coupling the trays via hydraulic cylinders 82 causing their pins 84 to extend into an interlock relation with one of the apertures 67 of ribs 66 extending along the topside of tray 30 on being coupled the middle tray 30 and upper tray 40 are withdrawn or retracted concomitantly by reversing operation of the push cylinders 72 and 74 so as to retract and withdraw tray 40 during withdrawal.