What does the red mean?

[v0031]

When you're traveling, the last thing you want is to be held up at the airport. Not only is a delay stressful, it can make you late for an important event. Avoid an airport headache by knowing what you can and can't take onto a plane. Some items can be checked with your luggage but not carried on, while other things are completely prohibited from the aircraft.

[True Federalist (진정한 연방 주의자)]

There are some things it is okay to put into the checked luggage that will go into the cargo hold of the plane, but not into the carry on bag you bring into the cabin with you.