I don't think that search is very valid - the TUI group travel companies are likely much more mentioned than Terminal User Interface. They are pretty big around the world and have an airline, cruises, hotels etc.
Yeah, but Preussag only changed its name to Touristik Union International in 1997[1], so I think the user interface interpretation clearly predates the travel agency one.
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[1]: https://en.wikipedia.org/wiki/TUI_Group