Charging Macbook with Macbook Air's power adapter

I have noticed that the power connector on the late 2008 aluminum Macbook accepts the Macbook Air's power adapter's plug. The Macbook Air's power connector also accepts the aluminum Macbook's power adapter's connector. So, can these power adapters be used interchangeably? The output power specifications are a little different. The Macbook Air's power adapter supplies voltage that is a bit lower than the aluminum Macbook's.
The reason I am asking is that if my wife and I both travel with our laptops (she has Macbook Air and I have the new Macbook), it would be nice to be able to bring only one power adapter and use it with both laptops. I have also noticed that the airplane power adapter shipping with the aluminum Macbook (late 2008) is the same one that I bought for my wife's Macbook Air. However, according to Apple, the airline power adapter does not charge the battery, but only powers the laptop.

It is safe to use your macbook power adapter on the macbook air, but not the otherway around. The macbook air power adapter won't supply enough power to the macbook and probably will overheat and eventually burn out (if not worse).
Glor

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