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In page Vickers Viscount:

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The Viscount's good performance and popularity with customers encouraged Vickers to privately finance and develop an enlarged and re-engined variant of the Viscount, later designated as the Vickers Vanguard.[17] The Vanguard drew extensively from the knowledge and design of the Viscount, and likewise maintained its advantage of lower operating costs over pure jet-powered aircraft, but its disadvantage in being slower than jet aircraft became increasingly critical as jets became more available over time.[18]