CV880, KLM (Royal Dutch Airlines) have the leading edge inhibit for WAI (I've just found a wiring schematic for it). I'm sure there are other airlines with this option. LH?
Surprisingly, even on the wiring diagrams of 744's without the LE flap inhibit, there is a reference to the WAI system in Chapter 27.
For those with access to Boeing manuals ...
Boeing Wiring Diagram Manual (WDM 27-51-11) shows an output from the Flap Control Units (pin H6 in plugs DM7879CA, DM7881CA & DM7880CA), in dashed lines, to "30-11-11" (which refers to the WAI). However, when you go to 30-11-11, there is no cross reference to the flaps. "H6" is internally labelled "FLP 1 NOT RET" (???)
Rgds.
NSEU