Thanks for the question and welcome to FlyerTalk.

You're likely to get a few opinions here. Before i chime in with my thoughts, I was wondering where the problem with Delta was - service, program, policies, etc. This will help some of us give you a little more direct advice.

Te first thing that comes to mind is that with the airlines you have listed, you really do not need to leave the Delta program, you can add to your account with any of these airlines and not feel you have to start all over again which is why i was asking where the problem is with DL.

Again, welcome to FlyerTalk and let's see if we can assist you with some advice for another airline to fly and earn miles from.