I tried to request credit for two flights I made recently on Air Canada.
It’s difficult to find the right place on the Aeroplan website. But eventually I did.
Aeroplan > Request Mileage Credit
But when I filled in the much too detailed data required, I got only an error page:

The data is right. Aeroplan and Air Canada suck.
Thanks to Peter Long for pointing out that I had the wrong airport. Montreal Dorval has changed names to Montréal-Pierre Elliott Trudeau International Airport. (2004)
They truly do what they can to ensure so called valuable customers do not get credit for mileage.
Why not automatically credit every flight?
Air Miles programs will be dead to me after I use up the 70,000 points I have left on this crappy airline. I’ll do everything I can to avoid AC.
related – Aeroplan® expiring me
==== UPDATE:
After submitting, did I get credit for the miles?
Your request for mileage credit has been received. The missing Aeroplan Miles will be validated and, if accepted, the miles will be posted to your account within six weeks. No confirmation e-mail or letter will be sent.
Screw you very much, Aeroplan. Six weeks?
What? You will have an employee confirm this request?
Aeroplan deserves to go out of business.
Now I have to phone them – GAWD AWFUL – because my miles might expire July 25th, before the 6wks, if I don’t.