Who needs to sign the PIC signature line on the flight release?

The Captain of the flight is responsible for signing the Pilot in Command (PIC) signature line on the flight release. This is a critical part of the flight release process since the Captain is ultimately accountable for the operation and safety of the flight. The flight release document acts as a legal authorization for the flight to proceed, and the signature of the Captain confirms that they have reviewed the necessary information, including weather conditions, aircraft readiness, and crew qualifications.

By signing the release, the Captain also affirms their responsibility for the decisions made during the operation of the flight. It's important to establish clear accountability and chain of command in aviation, and the requirement for the Captain's signature helps reinforce their role as the leader of the flight crew and the primary decision-maker in all operational matters.