This is bad news 
BRU used to be my home airport (and still in the top 3 airports in my flight diary!) and have used this shul countless times, both for davening and just a quiet place to sit - in the days when I didn't have lounge access 
Do you need a proper letter e.g. Word document or can I just write it in a PM to you? (More likely to actually do the latter)
I'll post in a few Whatsapp groups I'm on with fellow twerps and see if I can get anything.
Thank YOU very much.
Plain PM is great, I'll turn it into a letter with a name and add a date.
It would be great if you could get more people to write, just note:
There is an internal talk about this, so officially nothing is happening.
We just don't want any decision to be made.
The airport is a private company, so they can do as they please.
If it seems people enjoy or frequent the airport because of it, it is of interest to them.