Utilize the input text as a context reference, choose the right relationship between flying and aviation 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.

So there's really not that much dependence on long-haul air travel for example, probably not that much difference on regional air travel; obviously, China's got a big aviation business and those planes are back flying and they're back flying at bigger numbers than they are in the US.

Answer: industry