How does the Homeland Security Advisory System relate to air travel?

How does the Homeland Security Advisory System relate to air travel?

The coloured alert system was put in place by the Department of Homeland Security to give ourselves, other agencies, and the public a better idea of where we see ourselves in terms of threat at any given time. Currently we are at orange in our nation's airports, which means we have introduced and implemented other pieces of security that passengers traditionally don't see, but we do, for example, have random screening of vehicles at the entrance to the airports. We have an increased presence of K-9 teams. We have other non-obvious security tools in place at the airport. Basically what it means is that we have more security in place or enhanced security in the airports.