Who is responsible for briefing a domestic or flag air carrier pilot in command on all available weather information?

The aircraft dispatcher has the primary responsibility for briefing the pilot-in-command on all available weather information. This role includes gathering and analyzing weather data relevant to the flight route and ensuring that the pilot is fully informed about current and forecasted weather conditions that could impact the flight's safety and operations. The dispatcher acts as a critical link between the airline's operational information and the flight crew, providing vital insights that contribute to safe flight planning.

While the director of operations oversees the overall functioning of the airline and the company meteorologist provides specialized weather services, it is the dispatcher who has the direct responsibility to ensure that pilots receive all pertinent weather briefings before flight. This encompasses understanding the flight's route, destination, and alternate airport conditions.