New TSA rules allow knives with a blade less than 2.36 inches in length, and less than 1/2 inch thick at it's widest point.
Any knives with fixed blades or blades that lock will not be allowed. Also knives with a molded grip, box cutters and razor blades.
The TSA will also allow some sporting equipment, including pool cues, hockey sticks, lacrosse sticks and ski poles. Golf clubs will also be allowed in carry on, but there's a limit of two.
You are also free to take a bat on a plane as long as it measures less than 24 inches.
Air marshal and flight attendant officials are opposed to these changes, saying that it will put them at risk.
But a TSA administrator said they did consult with experts and air marshals before making this decision. And it will allow screeners to focus more on things like explosive devices.