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Equipped with a wireless sensor, it activates a pink light attached to another sensor installed on a metal bar next to special priority seats, usually at the end of subway cars.

该设备配有一个无线传感器，与另一个装在特殊专座(通常在地铁车厢的两头)金属把手上的传感器相连，能够发出粉色的光。

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Priority boarding is also a big draw, because Southwest's chaotic no-assigned-seats system can be a turnoff for travellers unwilling to push to the front of the line or throw a few elbows for a window (or aisle) seat.

ECONOMIST: Business travel