What happened January 1979AD in Iran

Khomeini was not allowed to return to Iran during the Shah's reign (as he had been in exile). On 16 January 1979, the Shah left the country (ostensibly "on vacation"), never to return.

Two weeks later, on Thursday, 1 February 1979, Khomeini returned in triumph to Iran, welcomed by a joyous crowd estimated (by the BBC) to be of up to five million people.

Bakhtiar invited Khomeini back to Iran, with the intention of creating a Vatican-like state in the holy city of Qom, declaring that "We will soon have the honor of welcoming home the Ayatollah Khomeini". On 1 February 1979 Khomeini returned to Tehran in a chartered Air France Boeing 747. The welcoming crowd of several million Iranians was so large he was forced to take a helicopter after the car taking him from the airport was overwhelmed by an enthusiastic welcoming crowd.