I doubt if any corporation "hates" despite Romney's insistence that corporations are people too, my friend. The airlines -- and the other companies severing ties with the despicable NRA -- are making a public statement of solidarity with the victims and their families. They no longer wish to be associated with an organization that is fighting tooth-and-nail against any measures to stop the murders. Surely you also support stopping the mass shootings too, right?
PS--I doubt if they have any say about air marshals being allowed on flights, since the marshals are federal employees and the airlines' safety measures are regulated by the federal government.