The main interest in your case to reach Gold is to have lounge access. But you will not have lounge access for pure domestic flights in the US. So you will not really enjoy a lot of benefits if you only fly domestically in the US.
Originally Posted by
kmersh
With that said, I have for a while now credited my DELTA miles to Frequency Plus, now Flying Blue (I have always been Silver or iirc RED before that)
FB Silver was the equivalent of Fréquence Plus Blue, not red
