I found a nice business class fare from BOS to DEL on Virgin Atlantic. I can earn MQD to help keep my medallion status on Delta, correct? Delta medal on BOS to LHR, but Virgin the rest of the way, but Delta's pricing is 2.5 times the cost.

Just want to double check before I commit.

Out of curiousity, if Delta.com offered the same price. Would it be better to have Delta or Virgin ticket the trip?