People inside Southwest Airlines are speaking out carefully and pointing out why there are so many flight disruptions. Essentially, the background issues are what were discussed earlier. Pilots are pushing back against vaccine mandates; and if you think about the curriculum vitae of a typical pilot, it makes sense.
A big percentage of commercial airline pilots are former military pilots. That group of people carry a strong disposition toward the principles of patriotism, service, liberty and freedom.
It is a simple truism that upsets leftists, but it makes sense for this specifically skilled workforce group to be the tip of the push back spear.
Alex Berenson provides some background details after being contacted by a Southwest pilot: “The pilot emailed following the first Southwest post today (and provided his SWA ID to prove his identity). He asked that I paraphrase the email.
Essentially, the union cannot organize or even acknowledge the sickout, because doing so would make it an illegal job action. Years ago, Southwest and its pilots had a rough negotiation, and the union would not even let the pilots internally discuss the possibility of working-to-rule (which would have slowed Southwest to a crawl).

If this OSHA change becomes law, the Biden administration will force American businesses to choose between vaccinating their employees, testing them weekly for Covid-19, or going bankrupt under crippling OSHA fines.