Good point, Brian.
It's also important to note most airline systems are legacy based systems that require you to memorise keystrokes - people don't like them as unlike a GUI they are very hard to learn.
We are changing our departure control system from a green screen unisys system to a Amadeus based GUI - and that has been getting worked on for years and hopefully will be implemented next year.
Unfortunately these systems have so many touch points for other parts of the airline that changing them is a monumental effort and can take time to change, but is most certainly worth it for reliability, better service, and easier training of staff.
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