Delta to Cut Up to 7,000 Jobs  ATLANTA (Reuters) - Delta Air Lines Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=DAL.N target=/stocks/quickinfo/fullquote"&gt;DAL.N&lt;/A&gt; on  Wednesday said it will cut 6,000 to 7,000 jobs, or about 10  percent of its work force, over the next 18 months and drop  Dallas/Fort Worth as a hub as it tries to avert bankruptcy.