United (though I haven't flown them in more than 4 years for various reasons)
American
Continental
USAir/US Airways
TWA
Midway Airlines (its first incarnation)
Virgin Atlantic
Air France
Iberia
El Al
I found United's service to have declined steadily in the last few years that I flew them; I can't speak for what it is like more recently.
Most of my flying these days is with American and Continental - I'm a frequent flyer member with both.
My only time on Air France was a trip to Guadeloupe (via Miami and Port Au Prince) when I was a young kid - many years ago. The most notorious thing about that trip was Haitian troops marching us off the plane in Port Au Prince at gunpoint and forcing us to buy from the airport duty free shop.