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MQMs are based on distance flown and fare class, and it doesn't matter where you book the tickets, so long as they aren't sold as an "opaque" ticket, like priceline.com or hotwire.com. Such sites will disclose that you won't earn miles for the booking, and do not tell you the airline you fly on until after you have paid.
The Program Rules state in part that you won't earn any SkyMiles credit of any kind for:
Bookings made through some Internet sites as described at those sites, including without limitation tickets purchased through priceline.com and Hotwire.com.