Satchip, your question frame the issue perfectly. ALPA's legal determination is that there is no such thing as "struck property" from this point. If you as a passenger have flown Airline X between two cities for years and Airline X goes on strike; if you choose now to go to Airline Y to fly, can the pilots of Airline X call the pilots of Airline Y scabs? Can Airline Y refuse the new passenger?

No, they can't they can't refuse the flying. Same with cargo. A cargo customer has the right to move their business anytime they want to any carrier. What can be done with cargo, as we saw with Atlas and recently at Amerijet, crews can scrutinize each cargo airbill and refuse to carry cargo that was consigned to the striking carrier and on their aircraft.

What CAN'T be done is for Airline Y to come onto X'x property and use any of their equipment, gates or otherwise. Just like if a cargo carrier showed up on another carriers ramp and carried their branded cargo.

Hope that helps.