Originally Posted by JetBlueFA

The movie channels start their programming as soon as the wheels are retracted. They run some short programs for the first few minutes of the flight before the movies start playing. The movies will run on all TVs for the first 30 minutes as a free preview. After the 30minutes, if you haven't swiped your CC the TVs will block out those channels. On longer flights the channels become available again as soon as the first round of movies are complete as they do run a second time on those transcon flights.