But if you can cancel for a flight credit, for all practical purposes they would still appear to be changeable with a fare difference. Assuming there are no fees involved with attempting to use flight credit. DL has similar weirdo language for their BE fares. They say they are "non-changeable", but you cancel for e-Credit minus $99 fee ($199 international). So they would actually technically still be changeable, but with a fee applied to change.