Cargo aircraft rail system

1. A cargo rail system for a payload comprising at least one rail unit with

an inboard rail extending longitudinally from a front end to a rear end and having a longitudinally extending recess therein for slidably receiving a lip on a payload;

an outboard rail spaced from said inboard rail, said inboard and outboard rails being pivotally attached to inboard and outboard hinges respectively for movement between an upright position and a flat position;

at least one latch mounted on said inboard rail and having a latch plate extending into said recess for engagement with said payload, said latch being pivotally mounted for movement between an engaged position retaining said payload via mechanical forces and a disengaged position releasing said payload; and

at least one latch mechanism configured to hold said rails in their respective upright positions and respective flat positions.

2. The cargo rail system of claim 1 , wherein the latch plate retains said payload in a fore-and-aft position in the engaged position and releases the fore-and-aft retention of said payload when moved to the disengaged position.

3. The cargo rail system of claim 1 , wherein said latch plate is spring biased into its engaged position.

4. The cargo rail system of claim 1 , wherein the latch is pivotable about a longitudinal axis.

5. The cargo rail system of claim 4 , wherein the latch plate extends substantially perpendicularly into the recess in the engaged position.

6. The cargo rail system of claim 5 , wherein the latch plate pivots in the direction toward the outboard rail when moving to the disengaged position.

7. The cargo rail system of claim 1 , comprising a second rail unit of substantially the same design and laterally spaced from the at least one rail unit with the respective longitudinal recesses facing each other.

8. The cargo rail system of claim 1 , comprising a lever system for moving said latch plate from said engaged position to said disengaged position.