Iran's ambassador to Beirut, Mojtaba Amani, told Iran's state television on Friday that Iran would allow the planes to land only if Iranian flights were allowed to travel to Beirut.
The official further said that Lebanese President Joseph Aoun has a "once-in-a-generation" opportunity to lead Lebanon away from Hezbollah and Iran's stranglehold.
The Iranian plane took off from Tehran and was carrying Lebanese passengers.
Nasrallah, who had served as Hezbollah's secretary general for more than 30 years, was killed on Sept. 27.
Aoun must navigate Lebanon’s sectarian divides, restore trust, and fortify the Lebanese Armed Forces. While there is room for optimism, the path ahead demands unwavering resolve and resilience.
Salam said he would work for justice for the victims of the 2020 Beirut port explosion, which killed at least 220 people and no senior official has taken responsibility for.
Aoun's media appearances are extremely rare, and he has not stated a view on Hezbollah's arsenal.
Aoun kept Lebanon's army out of the war that raged between Israel and Hezbollah for over a year.
Qassem claimed that at the time of the ceasefire's announcement in late November, Hezbollah still had significant military capabilities.
The Rafic Hariri International Airport had been in a state of alert following reports that the flight may be carrying funds for Hezbollah.