Delta Up on Financing, Analyst Upgrades  CHICAGO (Reuters) - Shares of 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;  jumped 21 percent on Tuesday, as Wall Street analysts said the  possibility of a near-term bankruptcy diminished with the  carrier securing additional financing and intensifying  concession talks with its pilots.