Which carrier's apron are flight attendants required to wear?

Flight attendants are required to wear the carrier's apron associated with their specific airline as part of their uniform standards and to maintain a professional appearance while in service. In this case, United (UAX) is identified as the correct answer because it is standard practice for carriers to provide their flight attendants with company-specific uniforms, which include aprons when applicable. Uniform regulations not only foster a cohesive brand image but also ensure that crew members are easily identifiable to passengers, enhancing overall service quality.

Each airline has its own policies regarding uniforms and what components are included. While other airlines like Delta Air Lines, American Airlines, and Southwest Airlines have their own distinct uniform guidelines and will provide their attendants with appropriate attire, the specific requirement for wearing an apron is unique to United Airlines in this context. This ensures that attendants from each airline represent their company consistently and professionally.