What happened is some dummy ran the fact that all of a sudden their social media, email, call centers were being slammed by angry leftists. The problem is that there wasn’t saner heads at the top that said we need to take a deep breath and not do anything stupid. What Delta and United did was give their competitors who kept their mouths shut a beautiful windfall.
How much you want to bet it wasn’t even really a whole lot of Lefty/Progs, just a few who turned an email bot loose on them.