Thanks rankourabu, I am just still confused...sorry

Example: S fare on Air Canada ticket entitles me to 100% miles when flight is operated on AC metal. But what happens when they rebook me on a Lufthansa operated flight and keep the S fare then I would only be entitled to 50% miles. This is how I understand it when reading up on it on aeroplan.com.

All scheduled flights operated by Lufthansa, CityLine and LH Train service are eligible*†.
Please refer to the tables below to see how many miles you'll earn based on eligible booking class.

Mileage Earned‡§
All regular scheduled flights except for Intra-European flights**

Booking Class Aeroplan Miles
F, A, C, J, D, Z, P1, Y, B, M, H, Q, V, G, U 100% of miles flown

W, S 50% of miles flown