Hi all! Brand new to the forum, although I've lurked for a while.

My wife and I are going on a 2 week trip to Switzerland in the middle of July. Yes, I know that's the very worst time to go, but it's the only time my wife and I could get vacation at the same time. So the plan is to give ourselves a few days to get to ZRH, buy a crapload of passes (they're refundable, might as well...), and fly out of whichever US city has the most semi-open flights. However, this is my first time going transatlantic using ZED, so I have a few questions.

In a perfect world, I could buy one zone seven ZED pass for PDX-FRA on Lufthansa, and if the PDX-FRA flight wasn't looking good I could try SFO-FRA or LAX-FRA (both zone 7 routes) or even JFK-FRA (zone 5). In this perfect world, I could also use this ZED pass on LAX-ZRH on Swiss or LAX-LHR on AA, since they're medium-fare ZED carriers.

According to our pass bureau person, ZED is supposed to eventually function this way, but it's not there yet, with various airlines allowing various degrees of flexibility. My question is this: for which carriers is my "perfect world" scenario valid? Which airlines would accept a PDX-FRA pass when flying out of an airport other than PDX? Which would accept a ZED pass that had another carrier's code on it?

I suspect there is no definitive answer, but if anybody knows how their airline handles this, I'd appreciate the info. For that matter, I'd like to hear your own experience using ZED to get across the pond.

Vielen danke!