I have YQT-YYZ on AC, then YYZ-AUH on EY Etihad. the EY flight is actually an aeroplan booking as well. I know AC has an interline agreement with EY but im wondering if AC will be able to check my bags through and also give me a boarding pass to get through T3 security at YYZ. My layover is 9h at YYZ and EY desk opens 4h before departure leaving me 5h minus terminal change+AC delays to kill landside