Originally Posted by
tearex
Don't believe you can do both in the same transaction. Redeeming UR at 1cpp is an option, but far from optimal.
See if you can split your r/t fare into two o/ws, then look into booking DL using Air France/KLM Flying Blue or Virgin Atlantic Flying Club, which are UR transfer partners. Book with points one way, then eCredit the other way.
You CAN book the flight on Delta, apply your eCredit and pay the rest with your credit card and redeem the points for a STATEMENT credit. This implies that you do this after you pay for it on Delta.com.