Since TSA rules can occasionally be difficult to decipher, American Airlines issued a statement defining powder. "Powder-like substances are described as fine dry particles produced by the grinding, crushing or disintegration of a solid substance," the airline wrote.
"For ease of travel, TSA recommends placing larger items in checked baggage prior to arriving at the security checkpoint," Mike Bilello, a TSA spokesman, told USA Today. "The international aviation community and industry’s actions represent collaborative approaches that greatly enhance global aviation security."
Products that can fall under that category could include cosmetics, coffee, spices, baby powder, and protein mixes. Baby formula, medicine, and cremated human remains are exempt from secondary screenings, according to American Airlines. Gunpowder remains prohibited from all checked and carry-on luggage.