Major airports are starting to attach battery power active RFID tags to dollies to facilitate their fleet management. The active RFID tags can be detected at up to 100m away in open space from the fixed RFID reader antenna, which can be mounted at the aircraft loading bridges. The RFID tag report the dolly's facility number as well as the "battery weak" and "strong collision" status, making management of the RFID tags (and thus the associated dolly) easier.[2]