What is the relationship between Boeing Capital and aircraft 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.

Boeing Capital Corp. (IDR A) does not have an order book, but serves as a contingent financing source for Boeing customers, suggesting they too could have an increased funding burden under the scenario whereby airlines do not have access to capital markets or Ex-Im funding to finance aircraft purchases.

Answer: industry