If you’re a frequent flyer member of Delta or United, log on with your account and use the “compliments” or “contact us” link (upper right corner of home screen) to thank them for discontinuing their association with the NRA. We don’t want any backsliding under NRA member pressure!
And if you have an association with any other group that’s cutting their tie to NRA, be sure to thank them also! See ursulafaw’s NRA Meet Abyss, Abyss, This is NRA UPDATE and the Bloomberg.com article Delta and United Join Companies Dumping the NRA for lists of companies dumping the NRA.