From Prison Planet or Yemen Post.
A Yemeni official told Yemen Post that no U.S. cargo aircraft of any American company flew out of Yemen over the last 48 hours. "Whether UPS, Fed Ex, DHL or any other U.S. cargo company left Yemen over the last 48 hours."
See Also: Suspicious Package to U.S. not from Yemen; Yemenia Air Cargo Director
And: UAE rejects US claims on Flight 201
The Guardian's "official version" however makes somewhat different claims.