Not sure if I am allowed to link, but in Orbx’s Msfs support forum there is a post about jetways in WSSS. Someone then posted a link to an issue on devsupport . flightsimulator . com titled ”jetway issues on su 5”. In that post it claims that as of a few days ago the missing jetway issue has been identified, fixed and scheduled to be included in SU6.
Hope this helps someone.