On-board power options for long flights?

I have a MacBook on order and have a couple of transatlantic flights in the next few months. What are my options for powering the MacBook while on board? Both flights with British Airways who have "Empower" power sockets in the business class seats.
Thanks for any help you can offer.

Yes, just buy a general-purpose output adapter, like this:
http://www.compusa.com/products/productinfo.asp?productcode=303656&pfp=BROWSE
and then plug your Macbook adapter into it. I have a similar one that I've used on numerous flights within the US. I'm not sure whether these are compatible with "Empower" sockets, but if not, I'm sure you can find something similar that is.
These adapters are generally a bit bulkier and heavier than device-specific ones, but they work with anything, not just laptops or cell phones.

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