Hey,

I couldn't find these rules for NW, but most airlines have the same rules



* "Hidden City/Point Beyond Ticketing" - the purchase of a fare from a point before the customer's actual origin or to a point beyond the customer's actual destination.


Where a ticket is invalidated as a result of the customer's non-compliance with any term or condition of sale, US Airways has the right in its sole discretion to:

* Cancel any remaining portion of the customer's itinerary,
* Confiscate unused flight coupons,
* Refuse to board the customer or check the customer's baggage,
* Assess the customer for the reasonable remaining value of the ticket, which shall be no less than the difference between the fare actually paid and the lowest fare applicable to the customer's actual itinerary, or
* Cancel any Dividend Miles credits accrued as a result of non-compliant ticketing.

Cheers