Here is a trick answer. Tax write offs by the company (like R&D) don't count. Because then whoever is biggest gets the most. Plus, the consumer matters most since technically companies don't pay taxes - they just pass it along as a cost. So which industry has their consumers most heavily subsidized to incent them to buy their products.
Yeah. My answer was cars. Last I checked the federal budget for highways was around $44 billion. Georgia's DOT budget is around $800 million. Taxes on gasoline, toll roads, express lanes, taxes on trucks and so forth are all part of the ways in which cars are subsidized. Even before we mention auto bailouts and other subsidies there is a lot of government support to keep our cars rolling. Not arguing that this is good or bad, though that is a separate question, but just that government support is pretty much built into the system. Henry Ford was helped a great deal by the government and you and I would probably not even own cars if we had had to build our own highway system apart from the government.
I have not looked up the numbers on big oil but I suspect from research I did on this several decades ago that they continue to get sweetheart deals from the government that allow them to write off things that most small businesses can not. They also have been able to use public lands in ways that cost the tax payer millions. I remember a Washington Post article that showed that oil companies were leasing public lands for around $1.50 an acre. That's pretty good support if you can get it. But, for me, the bottom line is this. Big Oil was jump started by massive support from the government and would probably not exist today had that support been less bold. The same is true for the airline industry. So, whether cars, planes or oil, government was pretty necessary or these things would not have happened.
I don't read USA Today as a rule but found this article interesting.
https://www.usatoday.com/story/trav...-much-do-taxpayers-support-airlines/71568226/