As passenger transport constitutes its core activity, Vietnam Airlines plays a crucial role in the economic development of the country. It owns 100% of Vietnam Air Service Company – a regional airline in southern Vietnam and 70% of the low-cost carrier Pacific Airlines. In addition, the corporation earns revenue from airline catering and the maintenance and overhauling of aircraft through a number of its subsidiaries, including Vietnam Airlines Engineering Company and Vietnam Airlines Caterers. The company has also diversified its investments in the aircraft-leasing and airport ground-servicing industries, and is looking to manufacture aircraft components. It controls and operates a cargo division, Vietnam Airlines Cargo.