United Airlines Super Sonic Boom

$United Airlines(UAL.US)$ With the upcoming announcement today of the airline brining back the supersonic fleet to it's line up by the end of the decade it will create alot of buzz and hype in the industry. They are also first to makret for the only airline commiting Net Zero Carbon Flights. If I were $Delta Air Lines(DAL.US)$ and $American Airlines(AAL.US)$ I would be a bit worried.