Who conducts IOE training and administers line checks for flight attendants?

The correct choice pertains to the role of the Lead Instructor, who is primarily responsible for conducting Initial Operating Experience (IOE) training and administering line checks for flight attendants. This role is crucial in ensuring that newly qualified flight attendants receive the necessary hands-on training and evaluation while working alongside experienced crew members.

The Lead Instructor provides guidance and oversight during this critical phase, focusing on the application of safety protocols, customer service procedures, and emergency response actions in a real-world environment. By conducting these evaluations, the Lead Instructor ensures that flight attendants are well-equipped to handle the challenges of inflight operations and meet the airline's standards for safety and service.

Other roles, while important in their own capacities, do not specifically conduct IOE training or administer line checks. The Flight Supervisor oversees flight operations during flights, the Training Coordinator organizes training schedules and curricula, and the Flight Operations Manager manages broader operational policies and procedures. However, they are not directly involved in the individualized training and assessment of flight attendants in the operational setting, which is the key responsibility of the Lead Instructor.