Seriously, who ships heads?

Southwest Cargo had a statement about this whole incident:

You may have seen recent media reports referencing a Cargo Shipment containing human specimens that was refused by Southwest Airlines in Little Rock on June 9. Although it is common to transport human specimens for medical purposes, a longstanding Southwest Cargo Customer attempted to transport a shipment without following policies in relation to labeling, packaging, and properly declaring the contents. Southwest Employees immediately alerted all relevant parties to investigate the shipment and ultimately, refused to transport the items. Given the contents of the shipment, the local authorities were notified and assumed control over the shipment.

The above quote is from the Southwest Blog