There has been recent news
concerning people not
surviving the flight. When you sit for long periods of time
can form in your legs and in your groin
area. When you stand up, you can have a stroke
If you're flying internationally, do your best to go either Business Class or First Class. Flying from San Francisco to Hong Kong, Taiwan or Japan can be a boring flight. With the upgraded facilities, you'll be more comfortable and the food is better (I had four complete filet mignon dinners on my last San Francisco-to-Hong Kong flight). Get up once an hour and walk for a bit. If it is a 747 or higher jet, go upstairs to the lounge. Bring music (I recommend a minidisc player) and a laptop with a power adapter.