Has anyone noticed the New (and even old, tbh) ITA seems to get "overwhelmed" when you give it a few more options?
Example, I am searching for a vanilla one-way ticket YYZ to several asian cities for 13/14 Sep in business, no other advanced controls, which provides a TK option of $2394 USD:
However, when I add YOW, YUL, and CAN to the mix (no other changes), it no longer offers TK as an option (even though YYZ-TPE is still something it should have searched & offered):