Labuan LROFE
When I was on the LROFE trips to Labuan, we used to land there, kick a couple of Siggies out, and while they went off for the duty free, the a/c would do circuits, after an agreed time the a/c would land and pick the Siggies and booze up, and we would return to Changi. The flight time was then logged as chock to chock from Changi, even for the 2 Siggies.