This was great advice I read at another site:
"Humans respond to visual information best. All pilots should readily acknowledge that fact. Do you have a camera? Take it with you always. Take pics of any persons of middle-east descent you encounter, as well as those they are associating with. Record dates, times, tail numbers, location and any other pertinent data. Marks, scars, tatoos, etc. etc. Compare your images with wanted lists and any postings from the FBI listing persons wanted for questioning.
Send digital images you acquire to the FBI so they can compare with their database. This is war, and the enemy walks among us.
One of my occupations is photography, and I have searched my image database for any relevant images. I have high resolution telephoto lenses and intend to spend time each week like a tourist wandering around Islamic and Muslim areas and hang outs. We must be vigilant and root this evil out. This should not be misconstrued as some form of McCarthyism. My fellow Marines and other military services will no doubt take the war to the enemy abroad, it is up to us to support all law enforcement efforts to root out this menace at home.
America's Most Wanted is very successful because they bring images into your living room. Photographers around the world should make any pertinent image databases available to law enforcement. I have posted this on photography forums I visit, but I am also a concerned pilot so I post this here as well. I am certain that photographs of terrorists and their associates exist in archives of wedding and event photographers as well as general snapshot photographers. BE AWARE, BE ALERT, BE SUSPICIOUS, RECORD INFORMATION, COMMUNICATE!"