I should iterate through the entire text, replacing each word with three alternatives. I'll make sure not to change any proper nouns like ATR 72-600, X-Plane 11, Airbus, Leonardo, or regional airlines. Each word in the text (excluding proper nouns) gets three synonyms.

I also need to be cautious with compound terms, like "short-haul flights" in the previous example, where each word needs to be replaced separately but their meanings should still make sense together. However, the user hasn't provided a compound term here, just single words.

"The ATR 72-600 in X-Plane 11 comes with a range of scenarios and missions that allow users to put their flying skills to the test. These include:"

So applying that to the new text provided by the user.

Wait, but "The ATR 72-600" is a proper noun phrase. So "The" is a common word, and "ATR 72-600" is a proper noun. So "The" would be replaced with synonyms, but "ATR 72-600" remains. Similarly, "in X-Plane 11" – "in" is a common word, replaced; "X-Plane 11" is a proper noun, remains.