Buy an extra battery and carry both fully charged batteries with you. Airport power outlets are extremely hard to find, and to use one you are likely going to need to sit on the floor in the middle of foot traffic. Some airlines now advertise that they have computer power outlets in first or business class. Don't plan to plug your standard power cord in, though. Before you sit down in your hotel to work, dial an outside operator and verify that the local telephone dialup number for your computer system is actually local to the hotel.
Some cities have per-minute toll charges for calls outside a surprisingly small radius.
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