Singapore being something like 10nm in diameter, who controls the airspace around Changi, given that Singapore is surrounded by sovereign territory on all sides. Does Changi have control of other nations airspace.
Singapore controls the airspace above a certain altitude over parts of southern Malaysia and the nearby Indonesian islands.
Am I right to guess that Singapore control might be a multi national joint venture. Say if you are on approach to Batam Island (Indonesia), are you talking to an Indo controller that's in the Singapore Facility.
No, you’d be talking to a Singaporean controller initially and would then be handed over to Tanjung Pinang approach (Indonesian) closer to Batam.