USAir are generally a bit downmarket but LGW-CLT is one of their prestige routes. I've found service good (gone are the days anyone gives excellent service UK-USA). IFE was on demand. Main meal OK secondary snack (tea or breakfast) a bit of an insult. Wouldn't hesitate to use them again, however.
Never transferred at CLT but have done touchdown to Interstate (via car hire desks) in under an hour.