You found it. It's section 1, B Scope. The first sentence...

All flying performed on Company aircraft in its scheduled airline service will be performed by pilots on the pilot's system seniority list....


Read subsection a. ....

"Company Aircraft" means all aircraft owned or leased by the company, or of which the company has operational control


Then go to the ALPA website, login with your member number and password, and read the arbitration decision when AMR leased the planes to TSA. It explains exactly which sections of the contract were being contested, and there were more than just the airplanes issue being dealt with in the arbitration. Pay special attention to the section of the arbitrators ruling where he provided an example of what "would" be a violation of scope.

It's actually a fairly interesting read. It gives alot of insight into how these contracts are interpretted by arbitrators. It also is interesting that the company's only claim was that because Eagle was already in maximum growth mode, it was incapable of assuming the extra flying, and that is why they retained TSA's services. That fact was noted by the arbitrator as well.... and that situation (unable to staff) also no longer exists.

In any event, his exact example of what would be a violation has now occurred.