I remember around 2010 seeing ads about how KLM/AF did a huge upgrade of their passenger handling system - and how they explicitly went with TN3270 talking to z/TPF application as the new main interface for agents to use.
At least at the time, it sounded like they made a completely new application... and explicitly went with this stack.
Now, before you point to Amadeus still being command oriented just like that, modern Amadeus is accessed over GUI client - even if you're going to use all console commands.
Meanwhile when I had to reschedule a flight due to a volcano exploding and grounding all planes, I got to see what the KLM/AF local agent did. Fullscreen red-on-black TN3270 session. Took only a moment to handle my case and throw in a few extras.
At least at the time, it sounded like they made a completely new application... and explicitly went with this stack.
Now, before you point to Amadeus still being command oriented just like that, modern Amadeus is accessed over GUI client - even if you're going to use all console commands.
Meanwhile when I had to reschedule a flight due to a volcano exploding and grounding all planes, I got to see what the KLM/AF local agent did. Fullscreen red-on-black TN3270 session. Took only a moment to handle my case and throw in a few extras.