Utilize the input text as a context reference, choose the right relationship between Boeing Capital and aircraft from the options. Options: 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