tdrehm, I'd double check that you can fly sea-geg on DL. I'm pretty sure it is only Horizon that delta codeshares with on that route. You'll be stuck in SEA if that's the case
ZED is a pricing system for non-rev tickets that is based on the distance of your flights. It sounds like DL is giving you guys a flat service charge, which is nice and simple. I'd think it also helps your chances of being allowed to go through any city as long as your origin and destination are the same.
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