Which regular US airline company pampers their passengers with the most luxury and care?

Unfortunately, none of them, only Jet Blue amongst large US Airlines receives 4 stars from Skytrax, the world's largest passenger opinion and rating's service for airlines. Almost all the other US airlines receive a 3-star or average rating for service and overall performance. If you want pampering and service, try an Asian airline, all five of the airline's that receive a 5 star rating are Asian airlines, and most of the rest of the Asian airlines receive 4 stars.
http://www.airlinequality.com/StarRanking/3star.htm

only First class passengers are pampered.