The system determines at what altitude can a plane fly in a certain
airspace
or
The system determines at what altitude can a plane fly in certain
airspace
Word complains when using "a certain". Yes, I know I should be guiding myself after Word, but it often led me to insightful answers. In this case, I'm curious not only why it complains but also why to me the 1st version sounds better. I'm not a native speaker :)
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