Are you then implying disruption to air travel, within AC's control, is not the responsiblity of the airline because it did not happen on day of travel?

I am specifically referring to yyz_atc_qq's situation.

AC had a sked change. The new timing does not work for him. He was protected on a AC flight via FRA. Someone at AC then changes his reservation and places him back on a flight that does not work for him and places a note no backtracking allowed and does not tell him. Tell him / do one thing and when he's off the phone change the reservation?

Yes rules exist (i.e. no backtracking) but circumstances changed by AC. Just as yyz_atc_qq stated, perhaps he should mention to AC that something changed on his side and therefore he would like a full refund for one of his 9 future PNRs. Would AC oblige?

If AC insists that he does not backtrack, then AC should follow it's own rules in CIC*77 and put him, as he has suggested, on AF via CDG -- clearly AC will be more happy this way.

This is a change initiated by the AC not the pax. Clearly he has obligations back in YYZ mid-afternoon. I too would be anxious wondering if, a committment I made for work, based AC's committment to me, was still unresolved.

This person is a SE -- does his loyalty to AC not mean anything anymore? Where is the customer service for him? Clearly CIC*77 exists and yet the SE desk told him accept the change (i.e. the unacceptable flight that arrvies into YYZ at 15h15) or we'll give you a refund.

Regards