Vistara complements the multi-hub strategy of Singapore Airlines (SIA), thus making the loss-making Indian carrier a successful venture for the latter than some of its failed international projects, company’s CEO Goh Choon Phong, said on Monday. “We are having in-depth discussions about deepening commercial relationships with our partners in India and it could involve integrating Vistara and Air India. This is still under discussion,” Choon Phong said.