) "Alarm" means to frighten, and pilots never want to frighten the passengers. The alert passengers to oncoming turbulence so that they won't be frightened when they hit it. "In all respects" is idiomatic and is what is used in this situation.
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essam gaweesh"alert" and not "alarm"alert them - draw their attention to the situation
essam gaweesh"in all cases" is not different from "in all respects"in all cases - every time it happens