NOTE: There are other hazardous materials that are regulated by the FAA.
This information is summarized at gov, click on Passengers, then Preparing to Fly.
Rollin King and Herb Kelleher founded Southwest Airlines on June 18, 1971.
Its first flights were from Love Field in Dallas to Houston and San Antonio, short hops with no-frills service and a simple fare structure.
Ammunition - Check with your airline or travel agent to see if ammunition is permitted in checked baggage on the airline you are flying.
If ammunition is permitted, it must be declared to the airline at check-in.
Declare these items for inspection at the checkpoint.
Consolidating these containers in the small bag separate from your carry-on baggage enables TSA officers to screen them quickly.
3-1-1 for carry-ons = 3.4 ounce (100ml) bottle or less (by volume) ; 1 quart-sized, clear, plastic, zip-top bag; 1 bag per passenger placed in screening bin.
Air Activated - These are the more common disposable types that are activated when you open the package and expose them to air.
They contain liquid, so you need to adhere to the TSA 3-1-1 guidelines.