Our airline inducted two wide body aircraft (B747 and DC10) around the same time in the late seventies, and while waiting in the crew transport at the airport one day after returning from a 14 day New York flight pattern, I was told that my name was on the list for the big Boeing. I would be going shortly to Denver for the transition course.
While we had an airline ground training centre in Karachi, it was nothing compared to the training aids available at Denver. The method of instruction, aided by videos, cockpit procedures trainer (CPT), full flight simulator, and flight training ensured a good grasp of the airplane characteristics and handling.
This training formed the basis of a continued interest in professional learning, maintained throughout my airline career, and remains with me today. Later the experience of flying this jet with senior captains of our airline helped me a great deal when my reckoning came to captain the B707.