He said the aircraft underwent two routine inspections before it left Chicago.

Once there, the aircraft underwent a carefully documented test program.

This aircraft underwent a full restoration by Museum staff in 1981.

The aircraft underwent a program of continuous improvement and refinement during its production history.

The aircraft had undergone a maintenance check in the week before the accident occurred.

The museum's aircraft underwent major restoration over many years which involved its complete reconstruction.

The aircraft first flew on 6 April 1945 and underwent limited flight testing.

By the time the test program neared its conclusion the aircraft had undergone major changes.

The aircraft was still undergoing tests at the time of Japan's final defeat.

The aircraft underwent government trials in the fall of 1959, having been fitted with M-337 engines.