Thr APPR rationale doesn’t even have to make grammatical sense. This is Air Canada’s run-on sentence complete with a missing oxford comma, and an unexpected paragraph break mid-sentence.

"Upon review of your reservation, we are unable to approve your claim for compensation as the most significant reason for your flight disruption was due to flight crew member availability related to sickness, flight time limitations, valid visa, health documents not at a crew base

and was required for safety purposes."

On top of that, we had to pay for our luggage twice on the flight down and every time we tried to get compensation from one “partner” airline, they point us at the other.