U-2: Basic model, built in large numbers as a two-seat primary trainer.

It was designed specifically as a primary trainer, and first flew in 1936.

The Navy used the HT-2 primary trainers from 1956 to 1964.

Boats carried the letter "P" on their sails, to indicate they were primary trainers.

The aircraft was intended as a primary trainer.

"We learn to think the way the dog thinks," said Brother Christopher, the primary trainer.

The Tutor served for over 30 years as a primary trainer.

The aircraft is intended to be the sole primary trainer used by Chinese aviation schools.

They were used as primary trainers from 1939 to 1945.

The type was in service with the Finnish Air Force as a primary trainer between 1930 - 1945.