Answer:
I would say the vague phrase would be "That has not made passengers better."
Explanation:
The definition of vague: not clearly or explicitly stated or expressed. The last phrase doesn't explain anything, doesn't express anything clearly. Has not made passengers better at what? Why is it an inconvienience to passegers?
The vague word or phrase in the thesis statement is "that has not made passengers better"
vague word or phrase can be regarded as words or phrase that doesn't give a clear statement.
Therefore, "that has not made passengers better" doesn't give a clear meaning, which made it a vague phrase.
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