AC is currently updating secondary Mexico and Hawaii service through the peak holiday season till Jan 8.
All the Hawaii routes updated so far had been switched to mainline 767, all Mexico routes switch to a mix of 319 and 320. Some routes with delayed start for seasonal service.
[EDIT] Updated for KOA and CUN
For YVR service:
HNL - daily 767
OGG - daily 767
KOA - 2x weekly Rouge 767, move to morning flight
LIH - suspended
CUN - 3x weekly Rouge 767
SJD - up to 6x weekly 319/320, with delayed/slower ramp up
PVR - up to daily 319/320, with delayed/slower ramp up
ZIH - up to 3x weekly 319/320, with delayed/slower ramp up
Note that for the ZIH case, the frequency will start with as low as every other weeks at the beginning of the season
The Rouge will operate out of YYZ, 5x weekly early morning to YVR and red-eye back to YYZ.