In light of Saturday's events at Scotland's Glasgow International Airport and car bomb discoveries in London, the U.S. Department of Homeland Security has asked that citizens "remain vigilant to the events happening in your environment and report any suspicious activities to authorities." For pilots, this means doing our part by practicing the principles of AOPA's Airport Watch. Secure your aircraft and follow airport security requirements. Most importantly, be sure and watch for and report unusual or suspicious behavior to local law enforcement and the national GA security hotline 866/GA-SECURE.