What is the relationship between AmEx and American Express in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

American Express (Swiss: AXP.SW - news ) fell 0.3 percent after a US judge threw out a proposed class-action settlement with merchants on litigation over AmEx swiping fee restrictions.

Answer: operator