[Dave Marx]

I suspect things happen this way (WDW passes OK, APs not OK) is that in one case, DL would collect the physical passes and could hand them over to WDW for the appropriate cash credit. The procedure for figuring out how much DL would be owed for someone using a WDW AP (or vice versa) would be a bit more complicated - would they take the price paid for the pass and divide by the number of days the pass was used by the time it expired? Would they have to agree on a number other than that (based, perhaps, on the average number of days an AP is used)? Then, there's the added plot complication that WDW APs use magnetic stripes, and DL's use bar codes - one wouldn't work in the other machine, so Guest Relations would probably have to get involved... seems like Disney would decide it was more bother than it could possibly be worth.