Cocos (Keeling) Islands Airport lies in the tropics at 12.19° S, 96.83° E, on Indian/Cocos time (UTC+6:30). Tropical airports contend with heat and humidity, both of which thin the air and lengthen takeoff runs, and with convective storms that build fast in the afternoon.
Cocos (Keeling) Islands Airport has 1 runway. The longest, 15/33, measures 7,999 ft by 148 ft, which puts the field in the narrowbody standard category: the A320 and 737 families are at home here; widebodies would be tight. The surface is asphalt. It is lit for night operations.
Runway 15/33 is aligned roughly south-east/north-west, which is the clearest hint you get about the prevailing wind here: runways are built to face the wind that blows most often, because aircraft take off and land into it. Every runway here shares that south-east/north-west alignment, so a strong crosswind means a crosswind landing rather than a switch to another strip.
At 10 ft the field is effectively at sea level, which is the friendliest case for aircraft performance: maximum lift, maximum thrust and the shortest takeoff runs an aircraft is capable of.