THE GOOD NEWS AND THE BAD NEWS:

Five undercover agents of the US Department of Homeland Security posing as passengers last week carried weapons through several security checkpoints at Logan International Airport without being detected, officials confirmed yesterday.

The bad news: screening still sucks. The good news: it sounds like they’re using realistic tests. The other good news is that someone has perspective:

TSA officials said there are several other layers of airport security to guard against a hijacking.

For example, air marshals now travel on certain flights, they said, and pilots carry guns.

Yes, and that helps, too.