VAI calls on Congress to increase ATC investment to boost safety, maintain US aviation standards Vertical Aviation International (VAI) and a broad spectrum of aviation industry organizations are urging Congress to significantly invest in the US air traffic control (ATC) system to enhance safety following recent airline incidents. Read the letter to Congress. By upgrading infrastructure and addressing budget shortfalls, the US federal government can maintain and uphold high safety standards in the aviation sector. Read the white paper.