That's because you used the SODE ( by default TAB-S ) key to use a Jetway, which works ONLY with SODE jetways in 3rd party sceneries. GSX/SODE jetways MUST be operated from GSX, using the GSX hotkey ( CTRL+Shift+F12 by default ) and, since this method works both with GSX and non-GSX SODE jetways, you can just use that one every time.