medium · GMAT Verbal
A regional airline's operations team noticed that flights departing after 6 PM have an on-time arrival rate of 92%, compared with just 74% for flights departing before noon. The team concluded that the dispatch protocols used for evening flights are inherently more efficient than the protocols used for morning flights, and it proposed switching every flight in the fleet to the evening protocols.
The answer to each of the following questions would help evaluate the operations team's conclusion EXCEPT:
- Do morning flights disproportionately serve routes with more congested destination airports than evening flights do?
- How much higher is the average ticket price for an evening flight than for a morning flight on the same route?
- Is air traffic congestion around the airline's hub systematically heavier in the morning than in the evening?
- Were the on-time figures for morning and evening flights drawn from the same several-month stretch of the year?
- Are the flight crews assigned to evening routes, on average, more senior than those assigned to morning routes?
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