http://www.reuters.com/article/idUSN1510202120100415?type=marketsNews
*Delta halts 65 flights through Friday morn
*Several European countries close air space (Recasts, Updates with new figures, Delta Air, US/London, ash effects)
ATLANTA, April 15 (Reuters) - U.S. airlines canceled half their trans-Atlantic service on Thursday because of a gigantic ash cloud spewing from a volcano in Iceland that has closed airports in northern Europe, industry officials said.
A comparable number of flights, and possibly more, will likely be canceled on Friday, the Air Transport Association trade association said.