Apple MagSafe - Alternative Power Sources; 20 mm Port Adapter Requirement; Warning: Car Power Socket Use

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Other Power Sources
Some airlines may have 20 mm in-seat power ports that require the use of an
additional adapter (included in the kit).
To attach the 20 mm adapter to the MagSafe Airline Adapter, align the airplane logos
and slide the adapters together. Then insert the 20 mm adapter into a 20 mm port.
EmPower port 20 mm port
Warning: Never plug the MagSafe Airline Adapter, with or without the 20 mm
adapter or third-party adapter, into an automobile’s cigarette lighter or auxiliary
power socket. Using the MagSafe Airline Adapter in a car won’t provide power to the
computer or charge the battery.