Final answer:
Before every Delta Flight, Option 1: a safety briefing is completed in first class. This briefing is mandated to inform passengers about the aircraft's safety features and is prioritized over other services. Seatbelt checks are also done, but after the safety briefing as part of the aircraft's checklist for safety.
Step-by-step explanation:
The subject of this question points towards airline protocols and procedures, which fall under the category of Business. Specifically, it is concerned with the preflight protocols in place for the enhanced safety and service provided in air travel. Before every Delta Flight, a safety briefing is completed in the first class as well as throughout the cabin, which is a requirement for all passengers before takeoff. This safety briefing is designed to inform passengers about the safety features of the aircraft, the location of exits, how to use the oxygen masks and life vests, and the importance of seatbelt usage during the flight.
While services such as beverage and meal services are also part of the in-flight experience, particularly in first class, the safety briefing is universally prioritized across all classes in accordance with aviation regulations. A seatbelt check is also conducted by the cabin crew, but it occurs after the safety briefing as part of the final cabin check before takeoff. Airlines use a detailed checklist to ensure all essential procedures are followed correctly for a safe journey. Like other critical operation checklists used in industries such as healthcare with the WHO's surgical safety checklist, this preflight checklist is a key component in the aviation safety management system.