Originally Posted by carlitos
How can I get the 1200 euros the Montreal treaty states as the maximum (they lost more than that, as everything I had in my bag was worth more).
I am not really sure why you insist on "complaining" in advance (IB hasn't denied your claim yet).
You you should just file a claim with IB (in writing) and send copies to AA (which issued your ticket), and BA. If IB refuses to pay, you would then be able to claim from AA/BA.