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.
The basic system that allows a country or economy to function. Examples of infrastructure include roads, train tracks, telephone lines, and so forth. Infrastructure is often, but not always, provided by the government.