Who has the final say on whether a flight proceeds or not?

The pilot in command holds ultimate responsibility for the flight, including the authority to make the final decision on whether it proceeds or not. This role involves assessing various factors such as weather conditions, aircraft readiness, and safety considerations before making a judgment about the flight's viability. The pilot in command must ensure that all safety protocols are adhered to and is tasked with making judgment calls that could affect passengers and crew.

Other roles like the flight dispatcher or the flight operations manager may provide guidance or recommendations based on flight operations policies, regulations, and logistical considerations, but they do not have the final authority over the flight decision. The co-pilot assists the pilot in command but ultimately follows the lead of the pilot in command. Therefore, it is the pilot in command's training, experience, and responsibility that grants them the final say in whether a flight can proceed.