Everything you say is right and true for out-sourcing. However, I think the better point is that companies like this treat their IT platform as a cost center. T

Everything you say is right and true for out-sourcing. However, I think the better point is that companies like this treat their IT platform as a cost center. They need to invest in that just as much as new planes and amenities for passengers. This is the consequence of not doing so and having 30 year old systems still in the critical path. They have all built a spectacular mountain of technical debt. This is largely true for banks and hospitals and many other industries.