Originally Posted by
Widgets
The rule is free bag(s) for the medallion and up to 8 other companions traveling on the same flights to the same final destination--doesn't have to be the same reservation*. If any of the flights are not the same (ATL-SLC vs. ATL-SLC-LAX), only free bag(s) for the medallion.
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Technically, the rule is up to 8 companions on the SAME reservation, meaning the SAME PNR, not just on the same flight. The wording is a bit ambiguous, and I have seen it waived, but they do mean the same reservation.
From Delta.com -
Baggage fee waiver applies to up to 9 people traveling IN the eligible member's reservation. Excess, oversize, and/or overweight baggage fees may apply.