Editor’s note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter . Get news about destinations, plus the latest in aviation, food and drink, and where to stay. CNN  —  For years, long-haul flights have been synonymous with discomfort, dehydration and a distinct absence of glamor. Whether it’s a child in the seat behind kicking your chair for nine hours, your lips chapping from the dry cabin air or the minimal access to personal care amenities, passengers are often left feeling