Actually, some people do get migraine relief with salt! Its a rare trigger, but for some people, having a LOW salt level in the body is a migraine trigger. You can use fancy Himalayan salt if you want, but licking potato chips also works. If you are one of these people, salt will abort a migraine, sometimes even in the later stages.
BTW, there are tons of things that can abort a migraine. The term "abortive medication" is used by doctors to describe medicines that are taken when the symptoms start. They include the two classes mentioned above, but they also include NSAIDS, caffine, muscle relaxants, etc. My doc just started me on a barbiturate as an abortive. There are also non-medical abortives, like putting ice on the back of your head and the good-old nap in a dark room therapy.