Thanks. There may be different flavors of T so I tried to book it. The fare rules are as follows:

CHANGES ANY TIME CHARGE USD 100.00 FOR REISSUE/REVALIDATION. NOTE - THE USD100 FEE APPLIES TO ADULTS AND CHILDREN. CHANGES ARE PERMITTED PRIOR TO THE TICKETED DEPARTURE TIME OF EACH FLIGHT. CHANGES ARE NOT PERMITTED AFTER THE FLIGHT/S SCHEDULED DEPARTURE TIME AND THE TICKET HAS NO VALUE TOWARDS FURTHER TRANSPORTATION.

A. CHANGES BEFORE DEPARTURE OF THE OUTBOUND TRANSATLANTICK FLIGHT- THE ITINERARY MUST BE RE-PRICED USING FARES IN EFFECT ON THE DATE THE TICKET IS REISSUED. THE NEW ITINERARY MUST MEET ALL RULE PROVISIONS OF THE NEWLY TICKETED FARE I.E. ADVANCE RESERVATIONS/TICKETING DEADLINE/MINIMUM/MAXIMUM STAY/BOOKING CLASS/SEASONALITY ETC.

B. CHANGES AFTER DEPARTURE OF THE OUTBOUND TRANSATLANTIC FLIGHT- FARES IN EFFECT ON THE DATE OF ORIGINAL TICKET ISSUE MUST BE APPLIED. THE NEW ITINERARY MUST MEET ALL THE RULE PROVISIONS OF THE NEWLY TICKETED FARES SUCH THAT THE RECALCULATED FARE COULD HAVE BEEN USED FOR THE NEW ITINERARY IF PURCHASED ON THE ORIGINAL TICKET ISSUED DATE.

IN BOTH CASES THE ORIGINAL CANCELLATION CHARGE WILL BE CARRIED FORWARD TO ANY REISSUED TICKET. ---- WHEN THE ITINERARY RESULTS IN A HIGHER FARE THE DIFFERENCE WILL BE COLLECTED - AND- THE USD100 FEE WILL BE APPLIED. --- WHEN THE NEW ITINERAY RESULTS IN A LOWER FARE THE USD100 CHANGE FEE WILL BE APPLIED AND NO REFUND WILL BE MADE.

My reading is that the T fare used for this particular MFU is changeable for a fee of $100 and any difference between the price of a round-trip at the time of issue and reissue. Of course I run the risk T fare will rise or be dropped, but that is a risk I will be willing to take.

BTW, any idea if the charge is $100 per ticket or $100 for an itinerary that contains two tickets?