There is either a fare sale or a fare error on Star Alliance (UA/AC/LH) fares from Amsterdam over the summer to the USA. Almost every destination (except HNL) is £500-£525 per sector - about £1100 roundtrip. Mine has been ticketed so I am hopeful it will stick. The Business Fare is almost the same as Economy. I got AMS-LAX-SAN-SFO-FRA-AMS for £1098 all in.