The expressions once and however, in the fragments of the text “Once that desire is satisfied, monetary rewards can take precedence" (lines 28-29) and “However, equally important is a support system for the pilot." (lines 44-45), can be replaced, without change in meaning, by
In “Mechanical failures, when they do happen, are not nearly as catastrophic as they were 20 years ago." (lines 2-4), the author of the text implies that mechanical failures