This article takes me back to a time when I worked in Revenue Management for an airline. Amadeus was one of my mains tools.

One interesting aspect of the GDS is that they made efforts to have a better GUI, with point and click options, to facilitate the steep learning curve of the tool.

That effort was botched because of the existing use base was so well used to the DOS-like command interface that they simply ignored the GUI. A similar thing happened to Bloomberg and their terminals.

When I moved to tech and had to deal with experience revamps I always took this example with me. Even though you might have a better experience to users, do not underestimate the lock in of the current users to your existing UI.

Another great example of that is the now infamous Dig revamp....