Hi all,

I have Miles&Smiles membership and trying to get Gold card as soon as possible as similar to what many people are trying to do. I am living in Belgium and frequently travelling to US or Asia. My upcoming trip is to San Diego at the end of March and trying to find out which airways should I choose to get the most miles. When I use mileage calculator in Miles&Smiles, I see that I can only get 1000 miles if I book it in Economy class, which I find very low. My question is, does earning miles change from one airliner to another? For example, I can book the same flight from United Airlines as well. Supposing that the costs are exactly the same, would I earn the same miles? The question is valid for Lufthansa as well.
thank you