Hi!

Yes the existing tagging was a bit confusing for me, I haven't worked a lot with airport infrastructure before. I read up in the wiki the accepted methods for tagging jet bridges:
https://wiki.openstreetmap.org/wiki/Tag:aeroway%3Djet_bridge

According to the wiki the aeroway=jet_bridge tag is used in combination with footway or corridor - it describes a specific type of walkway rather than a discrete object. The bridge_outlines I think shouldn't have the jet_bridge tag at all, but being unsure I left them alone.

I tagged these carefully to differentiate between the fixed section of walkway (inside the bridge outline) and the movable sections of walkway (outside the bridge sections).