In a squat building just beyond the line of check-in counters at Auckland Airport's international terminal is ''its real-time brain''.
The Operations Centre has four shifts of around nine staff who watch a bank of screens to monitor movements of 20 million passengers a year around every corner of the airport.
They have visibility over nearly every part of the airport, monitoring it with 1000 CCTV cameras.
And in the nerve centre they see almost everything.
Asked whether emotional airport farewells or reunions develop into something more passionate very often, landside operations supervisor Ebrahim Cassim is discreet but says it happens ''quite a lot'', especially in cars.