I read about possible Moxy markets, SEA-JAX, AUS-BOS, but those former appears more long and thin than the latter.
I have previously mentioned AS adding SEA-JAX nonstop service being a possibility with JAX being one of the top destinations that AS doesn't currently serve nonstop from SEA. There is also likely enough O&D between SEA and JAX to support nonstop service to JAX on AS as the PDEW of SEA-JAX was 110 passengers per day in Q2 2019. AS also has an established FF base in the SEA market to support SEA-JAX nonstop service.
Moxy would also face the possibility of a competitive response from AS or DL in the SEA market if it adds SEA-JAX nonstop service, whereas AS operates some nonstop routes out of SEA that do not have nonstop competition. AS adding SEA-JAX nonstop service might also happen anyway, even if SEA-JAX nonstop service isn't added by Moxy.
AUS-BOS already has nonstop service on DL, WN, and B6, and AA will also be operating AUS-BOS nonstop service starting on April 7, 2020. There is no need for Moxy to add AUS-BOS nonstop service as AUS-BOS already will have plenty of nonstop service with DL, WN, B6, and AA all serving BOS nonstop from AUS.