I agree that alarm clocks that are easy to figure out, showers that are obvious to work, etc. are high on my list. Bathroom doors you can close without becoming a contortionist are nice as well.

How about airplane trays that are flat all the way 'down'? Some of us have long legs or big bellies - and a tray that isn't flat is about useless. If it is on a pivot, it can be flat without being all the way in my belly.

Another vote for the armrest near the window going up. Come on, folks - we want to rest and lean on the side - that armrest is just painful.

And can we not make the bathrooms on airplanes big enough to stand in??? Is that such a terrible thing?