I was going YYC-ATL. My choice was AA through DFW ( new 319's both legs) or AC through YYZ on the old 320's. No AA 763's involved (although I hear the seats in F are not that bad) I wasn't aware that AC had the 787 in regular service between YYC and YYZ.

AC was $2300 in J, AA was $1100 in F. Easy choice for me. I was pleasantly
surprised by AA, the American airlines have really upped their game recently. Even though it was a long weekend and the planes were full, every AA/US flight I was on left about 5 min before the scheduled time and arrived early. They were full too, but everything went smoothly. I did a mileage run on the way home and did 6 segments, all were punctual.