It's a new way of saying hello.

On the subway, you can often receive emoticons or WeChat IDs sent by strangers through the air. This is a new way of greeting that young people are used to nowadays. When you see someone you are interested in, you don’t have to worry about being embarrassed to ask for their contact information.

, and expressed his thoughts through air delivery.

Currently, only Apple mobile phone users can perform AirDrop.