Hainan Airlines typically offers Business and Economy cabins (with First or Premium Economy on some widebody/long-haul routes). Cabins differ notably in seating, catering, baggage allowance and mileage accrual.
For short routes economy is usually the best value; on overnight or long-haul flights Business meaningfully improves rest. Watch for upgrade offers with miles or cash around check-in time.
Product-wise: A long-time SKYTRAX five-star airline with a strong service reputation, Hainan Airlines is known for flying Boeing 787s nonstop to Europe and North America not only from Beijing but from second-tier cities like Shenzhen, Chongqing and Xi’an.
On loyalty: Fortune Wings Club members accrue miles by cabin, and elite tiers add seat, baggage and lounge benefits — worth joining if you fly Hainan Airlines often.