The list of companies terminating their partnerships with the National Rifle Association is growing as public outcry against the gun group escalates following the deadliest mass shooting at a public high school in U.S. history.

Delta and United Airlines said Saturday they will end group airfare discounts for NRA members and they were in the process of informing the gun group of this decision. Moving companies North American Van Lines and Allied Van Lines also ended their discounts with the group over the weekend.

FedEx — though refusing to end special discounts to NRA members — condemned the prevalence of assault rifles in the United States and said Monday it supports restricting them to members of the military.

"FedEx views assault rifles and large capacity magazines as an inherent potential danger to schools, workplaces, and communities when such weapons are misused. We therefore support restricting them to the military. Most important, FedEx believes urgent action is required at the local, state, and Federal level to protect schools and students from incidents such as the horrific tragedy in Florida on February 14th," FedEx said in a statement.

FedEx added Tuesday that its discounts apply only to NRA members, not the organization itself.