Orange is the second most severe advisory color; it means that the threat level of terrorist attacks is high. The Department of Homeland Security advises U.S. air travelers to take extra precautions when traveling during a code orange alert.
Red represents a severe threat of terrorist attacks; this is the highest threat level. Yellow represents a significant risk of terrorist attacks, and is a lower threat level than orange. A blue alert represents a general level of threat: it means that passengers should be guarded. A green code means that there is a low threat of terrorist attacks.
The DHS recommends that air travel passengers establish emergency preparedness kits and emergency plans for themselves and their families during a code orange threat level. It encourages travelers to take note of their surroundings and report suspicious activities to airport authorities.
