Tried to use a PD972 on numerous routings before mid Feb. All came up cheaper on regular fares except the AMS run which we decided to do in WBC sale fares for the 1.5 miles. Remember, the cert quoted price does not include all the add-ons for segments and fees. Almost anywhere WN is running a sale to will be cheaper straight out. But sometimes we find the coupons -- which arrive in the mail -- save some cash. Just not this year.