I actually flew a 737-8 ATL- MEX recently. The Live TV worked just fine (I was watching it it) until we passed New Orleans a d went out over The Gulf of Mexico (usual route of this flight) Few mins. Later the service stopped abruptly and message was displayed "service currently unavailable" or something similar. Guess they only license it over the USA and once it detects airplane is outside the desiginated area, it cuts off.