| CPC B64D 9/00 (2013.01) [B64D 2009/006 (2013.01)] | 17 Claims |

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1. A convertible cargo handling system, comprising:
a roller tray mounting system comprising:
a sealing plate; and
a first floor fitting coupled to the sealing plate, wherein the first floor fitting is configured such that a top edge of the first floor fitting is flush with a surface of a floor; and
a first roller tray comprising:
a first set of walls; and
a first roller tray fitting, wherein the first set of walls are configured to nest along sides of the first floor fitting below the surface of the floor and wherein the first roller tray fitting is configured to rest on the top edge of the first floor fitting,
wherein the roller tray mounting system further comprises:
a set of seal strips, wherein the set of seal strips is configured to provide a seal between a bottom edge of the first set of walls of the first roller tray and a top edge of the sealing plate.
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