A number of airlines have banned the transport of dead wildlife on their flights.
Hunters will no longer be able to fly the carcasses of their hunting trophies on American Airlines, United Airlines, Delta Airlines and Air Canada.
The banned animal trophies include lion, leopard, elephant, rhino and buffalo.
The move follows the slaying of Cecil the lion in Zimbabwe by a US dentist, and a 400,000-signature strong petition on Change.org.
US correspondent Patrice Howard told the Paul Henry programme this morning the move is being welcomed by animal lovers.
"The friendly skies just got a little bit more friendly for endangered animals," she said. "In addition to flammable liquids and weapons, you can now add these endangered animal carcasses to the list of things people can no longer check through airport security."
The airlines say hunters should transport their trophies on ships instead.
German airline Lufthansa and Emirates banned animal trophies earlier this year. South African Airways reversed its ban two weeks ago, instead opting for a crackdown on false hunting permits.
Zimbabwe is trying to extradite Cecil's killer, Walter Palmer.
Animal rights organisation People for the Ethical Treatment of Animals has called for Palmer to be hanged.