Gatwick North Terminal
Delta moved to the north terminal in October 1991. I flew to Atlanta from the South terminal and arrived back two weeks later at the North terminal. It caused a bit of confusion with the company driver as we chased each other back and forth. (No mobile phones).
Air 2000 originally focused on regional operations out of Glasgow and Manchester. The first two Boeing 757s were G-OOOA and G-OOOB which were both delivered before the airline's launch in April 1987. The Boeing 757 fleet doubled in 1988 with one aircraft being based at London Gatwick as well as one at Glasgow.
Air 2000 started operations at London Gatwick in April 1988 with the new entrant using the North Terminal.
Delta always used the gates at London Gatwick North Terminal pier 4, as did Emirates.