Republicans acting hypocritically? Doesn't sound like news to me although it's perfectly valid for you to continue to list the occasions when they do so.

It seems to me, from my perspective in the UK, that the US tide is slowly beginning to turn in respect of the NRA "guns are good" attitude. The recent, tragic, school shootings have helped turn this tide. Delta maybe recognise this change of attitude and have concluded that tacit support for the NRA is just bad for business in the long run. Although they are not doing this for moral reasons, it's still an indicator of the gradual and positive change in attitude toward gun control.