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One after another, companies under pressure from survivors of the Florida mass shooting are ending their relationships with the National Rifle Association. Avis, Hertz, Delta, United, MetLife and others have all done so since last week. But at least one major company has refused so far: FedEx.

FedEx offers N.R.A. members up to a 26 percent discount — the sort that the other companies have chosen to end. “Wait does @FedEx still support the NRA?” David Hogg, a senior at Marjory Stoneman Douglas High School, the site of the Feb. 14 shooting, tweeted this weekend.

Many students have called for a boycott of companies that support the N.R.A. In the case of FedEx, there are obvious alternatives: U.P.S., DHL and the Postal Service.