When embarking on a long-haul flight, it's always advisable to wear comfortable clothing to make your journey a tad more bearable. However, a flight attendant has warned against wearing black socks on a plane, suggesting it can lead to an unforeseen problem. Kris Major, a British flight attendant boasting 25 years' experience, claims he's done everything from swift short-haul jaunts to 14-hour stints in the air. He's perfected the skill of surviving on power naps at 30,000 feet and has