Market Presence. As a member of the B737NG family the fate of the -900ER is somewhat assured. The use of extra fuel tanks provides the range while the extra exits offers operators the necessary capacity to compensate for the higher weight - and cost. The extra tanks, which can be changed on a seasonal basis but no more frequent, do come at some cost both in terms of initial capital cost and operating weight. With orders of 520, the -900ER has secured a credible presence.
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