Lower fares already
Last week after the incident went viral I saw a $30 fare from SFO to LAS, the lowest from any carrier you see on this route is usually $49. Of course it was a Sunday morning 6:10 am flight but I think they our quietly deep discounting already.
If they do have a nationwide sale their competitors have to match prices on matching routes, that's they way it works with only 4 or fewer competitors in most markets.
-Paul