UPDATE 1-AIRSHOW-US lifts grounding order for Lockheed F-35 fighters-sources

FARNBOROUGH, England, July 15 (Reuters) - U.S. military officials have lifted a fleetwide grounding order for Lockheed Martin F-35 fighter jets, sources familiar with the matter told Reuters, improving the chances that the newest U.S. combat jet will make its international debut before potential buyers this week.