What is the relationship between Airbnb and Business Travel 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.

The company introduced a rudimentary system called Business Travel on Airbnb about a year ago, after it received requests for such a service-mostly from other tech companies whose staffers might not mind crashing on pull-out couches.

Answer: industry