Lebanon denied permission for Iranian flights to land in Beirut twice this week after the United States warned Israel might shoot the planes down, a Lebanese security source tells AFP.Israel has on several occasions accused Hezbollah of using the airport in Beirut to bring in weapons and money from Iran. The group — and Lebanese leaders — have denied those allegations.The first incident occurred on Thursday, when Lebanese authorities sent word to Iran that a Beirut-bound flight should not take off. n18oc_world n18oc_crux