N750PA Boeing 747-21 of Pan American World Airways
Douglas Holland Notes: Pan Am were the inspiration and launch Customer behind the development of the Boeing 747 with the first Pan AM order being signed in 1966 and the first Aircraft being delivered in 1970. The first departure for Heathrow being on 22 January 1970. Pan Am's arch rival TWA also took delivery of the Boeing 747 during 1970 and began to use them into Heathrow.
Pan American Historical Foundation.
Pan American World Airways - Wikipedia Entry
For more about the Boeing 747 Series see:
747 Family - Boeing Site
747 History - Boeing Site
Boeing 747 - Wikipedia Entry