Can't be done, really.
T is award class, and as such earns no mileage.
To "pay the difference in fare" would mean to buy a regular old ticket.
Originally Posted by CanuckNomad
Hello,
hope this has not been asked too many times before. I have a coupon for a free NA ticket (to be booked in T class) from a 2004 fly-3 promo. Can I use this (and pay any difference in fares) to upgrade this to a higher fare class that will earn miles? Is it worth it?
TIA.....CN.