Many messages on here refer to complaints. This is not one of them.
Living in northern England I try to visit my US Sacramento friends once a year, sometimes more often than that. I know that I am tempting fate, but after ten visits I have nothing but praise for the 3+ airlines with which I travel, always economy class.
KLM 6am from Leeds to AMS, then Delta to either Seattle or Portland, then onwards with either Alaska or Horizon. Well timed connections, good service, half decent food and excellent in flight entertainment on Delta...helped with a major purchase of Bose QC15 noise cancelling headphones. Outbound I watched 4 films, inbound 2,plus a good few hours sleep. Long may it continue.