Qantas Airways Ltd. investors will want to quickly forget this week. The stock slumped 16 percent starting April 18, headed for its worst week since June 2012, amid concern profit will be hit after Australia’s largest airline said it would make fewer seats available on domestic routes due to falling demand. The stock rallied 167 percent in the past two years, compared with a 3.3 percent loss on the benchmark S&P/ASX 200 Index.

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