The problems are caused by poor leadership since the very start in 1999 and perhaps even back to 1996 with AMR Corp or even earlier with AA. We were never an IT company.
Software in Sabre was always allowed to be hacked together organically without any grand plan by little team fiefdoms that competed against each other instead of collaborating together. Ill conceived proof of concept ideas became core products. Now there is a huge mountain of code, hack upon hack, incomprehensible numbers of technologies, the same wheels reinvented dozens of times, the same problems solved dozens of times, understaffed teams of jack-of-all-trades-but-master-of-none fighting constant support and stability wild fires, developers drowning in dev ops instead or developing, non-technical managers making technical decisions, managers who don't even understand what the products they own are let alone how those products work.
Will the new development just be more of the same?
Huge organizational changes would need to be made to fix this.
@QGeqDh9-1aof is OP