Optimization methods to control the in flight shutdown rate and the maintenance cost of civil aero engines are presented in this paper.

提出了民用航空发动机空中停车率与维修成本控制的优化决策方法。

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Mohammed Haggag, owner of Viking, a company that runs seven balloons in Luxor, said the flight shutdown meant that the whole industry was suffering for one pilot's mistake.

NPR: Fiery Balloon Accident Kills 19 Tourists In Egypt

And the top-flight administrators ruled out a winter shutdown, although chief executive Neil Doncaster accepts it would be of benefit.

BBC: SPL rules out winter break return

Gingrich had the advantage until, during a press conference, he suggested he had forced the shutdown because Clinton had ignored him during a flight from Israel.

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