You can't take Swiss on a OneWorld Explorer ticket, so that is not an option for you. I find AA's transatlantic business class to quite ok. Their seats may not be fully flat beds, but they have very good recline (especially on the 767's) and the best seat pitch in J (non beds) I have come across - 62 inches from memory. And if you are an AAdvantage member (and I assume you are since you are not considering BA trans-Atlantic) you may be able to upgrade to a very nice F product.