411A:
However, BA could blunt this objection by simply carrying an extra Captain on the seniority list...so as to not disadvantage those senior First Officers who are in line for the next Command course.
In my 27 years at TWA I saw perhaps 15 or 20 termination cases. Once the initial grievance was heard and denied they were all removed from the seniority list.
Perhaps 80% of them (certainly a serious majority) eventually had their job restored after arbitration. When restored they went back to the seniority they held at termination. That has been the standard industry/government practice in the U.S. under the Railway Labor Act.