I've noticed that T is gone for good as well SEA-YYZ. This only makes sense:

- All other transborder mainline carriers offer 100% mileage accumulation.
- Expedia, Orbitz, Travelocity will only display the lowest fare for each airline. If T was cheaper than T+, you would not accumulate Q miles when using these websites for booking.
- Mileage accumulation is an important benefit for non-domestic travel, since the competitors are mainline carriers.
- Thre were too many issues with booking United tickets on AC metal and getting the correct AP miles.

I am glad that Tango is gone for this route. Tango is still important for domestic because:

- no other competitor offersr EQM. Therefore, to the Cdn traveller, mileage accumulation becomes less of a factor.
- Aircanada.com is well advertised in Canada and is likely to be a booking engine of choice for those who want to accumulate Q miles.
- There is no codesharing of AC flights within Canada, so there is no mixup of different booking classes with different airlines.

My suspicion is that T still exists for some transborder flights to compete directly with other transborder Canadian carriers and the charters.