The discovery that terrorists had shipped explosive devices on UPS and FedEx planes points to weaknesses in security in the massive -- and massively complex -- international air cargo industry, which is seen as the most vulnerable link in aviation security. And because of that, another round of new security standards might come soon. To get a sense of how higher security standards will impact an industry built around speed, efficiency and economy, NPR's Michele Norris talks to Stephen Flynn, president of the Center for National Policy.