JERUSALEM (Reuters) – The Israeli Air Force announced a temporary halt in its stealth fighter F-35 aircraft activity on Saturday, following U.S. concerns over defects in pilot ejection systems. Aircraft will undergo inspections that will last a few days, the Israeli Air Force said on Twitter, and any individual F-35 operations will be conducted by special authorisation of the air force chief. The Israeli announcement followed a U.S. notice on Friday of possible defects in the explosive cartridges in pilot ejection systems aboard three U.S. military aircraft, including the F-35, which forced a …