Final answer:
The GOGO inflight internet can be switched on when the aircraft reaches a certain altitude.
Step-by-step explanation:
The correct answer is D) When the aircraft reaches a certain altitude.
GOGO inflight internet can be switched on when the aircraft reaches a specific altitude because it relies on satellite technology for connectivity. The internet service becomes available once the aircraft reaches a certain altitude that allows for a clear line of sight with the satellites. This altitude can vary depending on the specific capabilities of the aircraft and the location of the satellites.