Security
Operators Complain of Lost Revenue Due to TFRs

Before the 9/11 attacks in 2001, a one-mile bubble of airspace used to follow the U.S. President around, theoretically protecting him and his entourage from airborne threats. That bubble has grown to a 10-nm diameter ring surrounded by a 30-nm restricted zone, raising a key question: Is the risk of an attack now that much greater than it was before 9/11?