Warrior:
WAR/MNK, WAR/NIN

Thief:
THF/WAR, THF/MNK (both early on), THF/RNG, THF/NIN

Monk:
MNK/WAR

White Mage:
WHM/BLM, WHM/SMN (for auto-refresh)

Black Mage:
BLM/WHM

Red Mage:
RDM/BLM, RDM/WHM

Paladin:
PLD/WAR

Dark Knight:
DRK/WAR, DRK/THF, DRK/SAM (sometimes)

Ranger:
RNG/WAR, RNG/NIN, RNG/THF

Beastmaster:
BST/WHM

Bard:
BRD/WHM

Ninja:
NIN/WAR

Samurai:
SAM/WAR, SAM/RNG

Dragoon:
DRG/WAR, DRG/SAM (maybe?)

Summoner:
SMN/WHM