13-C. Termination by Notice. An Airline Party or ALPA may terminate this
Transition and Process Agreement on fifteen (15) days notice delivered to the
other Parties at any time following termination of the Merger Agreement under
Section 8.1 of that Agreement.

As it was explained to me, 13-C was the only way the agreement could be terminated unilaterally and since the merger has already progressed beyond the point of no return, this section no longer applies. FWIW.