For me the must have gadgets are:
- In ear headphones and ear-plugs that keep out the noise. I love my Shure SCL4-K in ear headphones
- Inflatable pillow to make it more comfortable to sleep on the plane.
- iPad so that I can have my own favourite or want-to-see movies without depending on whats available on the plane, as well as reading books, listening to music and reading my favourite magazines.
- 2 x 6600 mAh rechargeable battery pack to recharge devices on the way to my destination
- Travel adapter for power plugs, so I can plug in my many devices that need charging when I have reached my foreign destination
- Outlet extender, so I can charge lots of devices from one power plug