Surprisingly, there seem to be very little documentation on actually using them, but I think that the FlightGear wiki articles Animated jetways (permalink) and Howto:Animated jetways (permalink) might still be of at least some help.
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video) Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress) Some YouTube videos