What is the purpose of verifying that the forward-entry door is locked?

Verifying that the forward-entry door is locked is crucial primarily for ensuring passenger safety during flight. When the door is secured, it prevents unintentional opening during flight or taxi, which could lead to dangerous situations for passengers and crew alike. The integrity of the cabin is essential to maintain a safe environment, protecting everyone onboard from external hazards.

While compliance with FAA regulations is indeed important, the specific act of checking the door lock is fundamentally connected to passenger safety, making it the primary concern. Other options, like avoiding excess baggage claims and facilitating quicker boarding, represent operational aspects, but they do not address the critical safety implications inherent in securing the aircraft's entry points.