My wife and I are going to Hawaii (from Atlanta) for our 30th anniv and used miles to get 1st class. Neither of us have had lie-flats on long hauls before so we are going by what we can see online. We picked 5G & 5J for both legs on Airbus A330-300. They seem the best for a couple to converse across aisle without seat barrier we would have if we were next to each other. Delta just announced they are switching to 747-400 on May 1 so our return flight is now on the 'double decker'. We're trying to figure out the best 2 seats for the return to Atlanta which will be a red-eye. Delta gave us 11F and 11K which look about the same as 5G & 5J on the outbound flight. We are looking at whether we should either move further up to seats like 2 or 3 A & K on lower deck or move to upper deck for return. All seats except 74 A are available in upper deck right now, and most in lower deck are also available. Advice for us? Thanks in advance for any advice!