Your opening statement impresses me as a rather gross generalization. Kind of pro-union, anti-big business.
Nothing wrong with making an effort to lean out an organization, which is simply meant to make it more efficient and more competitive. It's not specifically just cutting staff, it's a lot of things. The trick is to not confuse leaning out with cannibalization. Like Musk says, if you aren't having to add stuff back in, then you aren't deleting enough.
The airline industry is under insane pressure given the environment, and this stuff is bound to happen. Safety may even be unintentionally sacrificed. This space is far from thermodynamically sound right now. If somebody has an easy answer for it, that would be some fat consulting stacks for the BTC fund.
I'll counter your generalization with my own: F250's are hammered with middle-management baggage. MM makes shitty decisions, and still causes tons of wait states. Having consulted for five F500's now, my observation so far is that the 250-500 range are much more incentivized to do what it takes to become more competitive. OTOH, the F20's I've consulted for severely need some waves of boomer (my gen) retirements.
BTW, the general reason M&A activity increases is because the associated market space has contraction pressure on it. What else are you supposed to do? The beginning of the end for markets, governments, empires. That's just the way us humans do things.