Turkish Airlines is going places. It serves more countries than any other, and it’s the world’s fastest-growing carrier. The man at the helm? A soft-spoken professor with a penchant for risk-taking whose “aggressive” growth strategy has seen profits jump 90 percent since 2013. Temel Kotil has big plans: In 2023, the year he predicts his airline will become the largest in the world, he plans to build the biggest-ever airport — serving 150 million passengers annually — in its hub of Istanbul.