They also cited some limit of 1288 (not sure which currency) under the Montreal Convention.
1288 Special Drawing Rights (SDRs)
SDR is a pseudo currency which allowed them to put a number into the convention.
The SDR "exchange rate" is based on a basket of currencies.
https://en.wikipedia.org/wiki/Special_drawing_rights
You can get an estimation using most currency converters e.g.
https://www.google.com/search?q=1288+xdr+to+eur