뭔 뜻인지 좀....SkyMiles Visa Check Card

Delta Air Lines has teamed up with Atlanta-based SunTrust Banks to offer a SkyMiles Visa Check Card, allowing cardholders to earn SkyMiles on all signature-based purchases.

Check Card를 보통 크레딧 카드처럼만 쓸때 마일리지를 준다는 뜻인가요?
첵카드로 머니오더 사면 안된다는 말인가요?