Similiar question -- not sure if this needs its own thread or if perhaps we should create a "BA Strike questions thread"

Have a OneWorld ticket for honeymoon starting 3/18 and ending 4/4; based on posted BA strike dates, the only flight I'm concerned about (as of right now) is BA 92, YYZ-LHR. We're getting to YYZ earlier that day via AA 1552 MIA-YYZ. Can I (and should I) call to try to pre-emptively route MIA-NYC-LHR on AA (or BA NYC-LHR)? If so, who do I call -- AA or BA?