What represents a key component of United Airlines' safety protocol for flight attendants?

Regular safety drills are a fundamental aspect of United Airlines' safety protocol for flight attendants. These drills ensure that flight attendants are well-prepared to handle various emergency situations that may arise during flights. Training through regular safety drills helps reinforce the necessary procedures for evacuations, handling in-flight medical emergencies, and responding to security threats. By participating in these drills, flight attendants gain confidence in their ability to react swiftly and effectively, which is crucial for maintaining the safety of both passengers and crew on board.

In contrast, other options, while important to the overall functioning of an airline, do not directly align with immediate safety protocols. Physical fitness training can contribute to a flight attendant's ability to perform their duties but does not specifically address safety scenarios. Customer service enhancement focuses on improving the passenger experience rather than safety measures. Social media engagement relates to communication and marketing strategies that are important but are not part of the safety training required for flight attendants. Thus, regular safety drills stand out as a key component of the safety protocol.