Thanks for that Kforbes, didn't read far enough down the Career Waypoint for that one.
Electronics
AT - Aviation Electronics Technician
Electrical
AE - Aviation Electrician's Mate *
Mechanical
AD - Aviation Machinist's Mate
AME - Aviation Structural Mechanic (Safety
Equipment)*
AMH - Aviation Structural Mechanic
(Hydraulics)
AM - Aviation Structural Mechanic
(Structures)
AS - Aviation Support Equipment Technician
Miscellaneous
ABE - Aviation Boatswain's Mate
(Equipment)
ABF - Aviation Boatswain's Mate (Fuels)
ABH - Aviation Boatswain's Mate (Handling)
AC - Air Traffic Controller*
AG - Aerographer's Mate*
AO - Aviation Ordnanceman
AZ - Aviation Maintenance
Administrationman
PR - Aircrew Survival Equipmentman*
* Class "A" technical school required
This gives you an idea as to what needs an A school for A PACT as I've seen one for S PACT around here.