My parents, who are approaching 80, purchased nonrefundable tickets in J LAX-AMS-LAX for August. They are legitimately nervous about flying to Europe (again they are almost 80) after the incident in Brussels. My father called and wrote to KLM about getting a refund, but was denied.

Anything that can be done to get the refund? I know they aren't entitled to it, but just seeing if there is anything they may have missed.

Thanks!