Airplane mode (or flight mode) means someone cuts themselves off from the world by not logging on to social networking sites or checking their cell phones. This usually occurs after a breakup or a rough work week.

“飞行模式”指某人不上社交网站，也不开手机，完全切断与外界的联系。这种情况通常在遭遇分手或者经过一周艰苦工作后出现。

This usage is derived from the cell phone setting of the same name which suspends many of the device's signal transmitting functions – thereby disabling the device's capacity to place or receive calls or text messages.

这种用法来源于手机设置中的“飞行模式”，手机处于这种模式时，电话和短信等需要信号传输的功能都不能使用。

For example:

Dan won't answer your calls. He's in  airplane mode.

丹不会接你电话的。他现在处于“飞行模式”。