First Class
The premium-most cabin on an aircraft, typically a private suite with fully lie-flat bed.
Full definition
First class is the highest cabin product, differing meaningfully from business class only on long-haul international flights. Modern international first includes private suites with closing doors, separate beds, onboard showers (Etihad, Emirates A380), and caviar-tier dining. Products vary: ANA First (The Suite), Singapore Suites, Emirates First, Etihad First Apartment.
US domestic "first class" is actually a glorified business product (recliner seat, no lie-flat). Don't confuse the two.
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