Currently, a shipper must be registered with the TSA. The airline or cargo company checks out the shipper to make sure it is legitimate. Airlines cannot carry cargo from a company or person they do not know or who is not a "known shipper."
WOW. really? then why our handling agents charging us $0.80 per kilo for "known shipper" and $1.50 per kilo for "unknown shipper"?
other bull***t: UPS (or say any other express) is defenately a "known shipper", but quite a reasonable portion of all UPS shipments comes from individuals who are "unknown" because they are never tracked.