Once a bag disappears from view, it travels down long belts at 7 feet per second as lasers try to read its destination from matchbook-size bar codes affixed at check-in.

• 办理登机手续时，工作人员会在行李上贴一张火柴盒大小的条形码，随后行李离开你的视线，接着以每秒7英尺的速度沿着一条长长的传输带往前行进，期间激光扫描器会读取条形码的信息，判断出要将行李送往何处。