The key to manufacturing Premier Silver status is to manufacture Marriott Platinum status. The reason for this is that United and Marriott have a partnership called RewardsPlus (found here). With RewardsPlus, Marriott Platinum members can sign up to get complimentary United MileagePlus Premier Silver status.
A backbone is a larger transmission line that carries data gathered from smaller lines that interconnect with it. 1) At the local level, a backbone is a line or set of lines that local area networks connect to for a wide area network connection or within a local area network to span distances efficiently (for example, between buildings). Download this free guide.
Hypernyms (backbone is a kind of...): skeletal structure (any structure created by the skeleton of an organism). Meronyms (parts of backbone): intervertebral disc; intervertebral disk (a fibrocartilaginous disc serving as a cushion between all of the vertebrae of the spinal column (except between the first two)).