BENGALURU: For state-owned aircraft marker Hindustan Aeronautics Limited (HAL), the 20-year-old Intermediate Jet Trainer (IJT) project still remains a major challenge, especially after the Indian Air Force (IAF) walked out of the project citing delays and design flaws. But the Bengaluru-headquartered defence PSU has not given up. After flying the aircraft after a gap of three years, HAL is now confident of going back to the IAF with a better product to train its fighter pilots.