subhrojitc wrote:
Please explian why not C?
The question indicates that the takeoff and landing slots are booked (
takeoff and landing time slots almost completely booked at most hubs), and option C says
the new 500 seat aircraft require boarding times substantially longer than those of existing aircraft.
The airlines want to increase the "volume of passengers they can fly in a given time slot". Here the restriction is on the takeoff and landing slots.
Boarding presumably does not affect those (unless the boarding process takes longer than the difference between the landing and takeoff slots, but that is not given). With the given volume of traffic at the hubs, the slots are booked, but nothing suggests that an airplane cannot
stay at a hub for the boarding of a greater number of passengers. Option C therefore gives us no strong reason to believe that the airlines will not go for the bigger planes. They have no other way to increase the volume of passengers.
In other words, for us to mark C, we would also have assume that the new boarding time will significantly affect a plane's turnaround time. That's a little iffy. D is far more straightforward.
Additionally, and I don't know whether we should really press this point, "hub and spoke" is defined as:
Quote:
systems of routing, in which large planes, which can seat 400 people and are capable of transoceanic flight, fly into hubs that have runways sufficiently long to handle them. From there, passengers are dispatched to local airports on connecting flights, on small planes
If we stick to this definition, we cannot assume that the boarding happens at a hub at all. The planes fly into hubs, from where passengers get on small planes. Where does the boarding happen, because we don't know whether the process works in reverse?
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