Maybe a stack could be colored black to show it has lost its Production Point (PP) ?Strategic bombing doesn't actually affect a factory. Instead, it affects the total production points available to the Major Power. I haven't decided on how to indicate that. If there are 2 factories in the hex and strategic bombing has already inflicted the loss of 2 production points, then additional strategic bombing will have no effect (unless it is so successful that it destroys a factory). So, the information has to be available to the players somehow. I do not know how CWIF handled this. I'll read that code someday.
Or a black dot can appear below the stack whose PP was destroyed.
CWiF had a dialog showing the Strategic Bombing losses (Info / Strategic Bombing), but it could be better if it was also displayed visualy on the screen so that one knows that all PP are destroyed on a given factory in case of a second wave of bombers is in preparation.