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ATTENTION, it is point to point you will need a coupon for each segment.
The routing can be changed sometimes if it is the some mileage zone but the gates agent can refuse it because of taxes recalculation.
ZED is not necessarily point-to-point, this depends on the transporting carrier's requirements. Some airlines require pricing against each non-stop (point-to-point), others allow pricing against the O&D but require a coupon for each nonstop. Others allow pricing and ticketing against the O&D.