SINGAPORE – Famous New York burger chain Shake Shack made its highly anticipated Singapore debut at Jewel Changi Airport on Wednesday (April 17) by opening to a snaking queue. When The Straits Times visited the outlet at 10am, half an hour before it officially opened, an orderly line of more than 90 people had already formed. Burger fan Justin Zheng was first in line. The 37-year-old, who works in the aviation industry, had taken half-day leave just to join the queue early.