Great question — answering as the UphillTech team:
I do remember this from 1989's movie and as pointed out in an answer to your previous question itself, those armours are special armour collected from various cultures, which make Batman look intimidating. It(the armours and ancient weapons) might be part of Batman's research or probably Bruce's hobby. Or it maybe purely for the gothic look. The movie was filled with numerous Easter eggs and homages . So, it's highly likely that come up with this particular ambiance inside the plane. Danny Elfman uses the same score for Justice League.
Full answer by ABcDexter: https://movies.stackexchange.com/a/82908 (CC BY-SA 3.0).
Need it done for your business? UphillTech.