Aircraft developed but not used operationally in the war are in the prototypes section at the bottom of the page.
Primary trainers are used for basic flight training while advanced trainers were used for familiarization with the more complex systems and higher speeds of combat aircraft, and for air combat training.
Intermediate trainers were used in several countries but additional hours at the primary stage made them redundant.
They may not have reached production before the end of the war but may have entered service post-war.
If the aircraft was deployed to regular squadrons or used in an operational capacity other than evaluation, it should be listed above under its appropriate type.