Here is the list of Bilaterals Sri Lanka has in place. No one uses the Belgian and US agreements right now, so if UL or SN would wet lease 9W to operate CMB-BRU, there would be chance, the 9W flights to the US can be sold as a tag on using the 5th freedom rights 9W has between BRU and the US/CA. Very very far fetched, not going to happen unless quite a few things change.