For too long, outdated rules based on old technology held back American aerospace innovation. Now, we are updating those rules for the first time since the 1970s. Today @USDOT announced a new proposal to enable civil supersonic flight by replacing speed limits with noise limits, ushering in a new era of safer, quieter, and faster air travel for all Americans.

That is from Michael Kratsios.  Here is how the 1973 ban first came about.  More details will be forthcoming, here is one concern from Eli.