NASA Gulfstream Shuttle Training Aircraft.
To train Space Shuttle pilots in landing the vehicle, prior to making their first spaceflight, NASA used a modified Gulfstream 2 executive jet. The cockpit was divided into two – with Shuttle controls on the left, and normal Gulfstream controls on the right. The flight dynamics of the Shuttle were calculated before the Shuttle actually flew, and the Gulfstream 2 trainer modified accordingly. The calculations proved to be so accurate that very few changes were made after the Shuttle entered service.