Cloud reflections on port wing of a B-17G 'Flying Fortress' a WW-II heavy bomber on display this week at the Fargo Air Museum. This B-17 is painted as quot;Sentimental Journeyquot;.

Each wing consists of
1) an inboard panel;
2) an outboard panel;
3) a wing tip;
4) a flap; and
(5) an aileron.
A trim tab is provided in the left aileron only. The engine nacelles, of semi-monocoque design, are installed in each inboard wing panel. The wing construction: spars and highly stressed ribs of the truss type. Corrugated dural sheet, attached to the rib cords, reinforces the skin to withstand compression loads. -manual