What free market type supports individual corporations writing laws that benefit themselves over their customers and competition? Boeing is already the only player in town, they aren't writing laws to benefit anyone but themselves, they aren't trying to increase competition or open up the markets.
Markets are built both on corporations openly trading value to customers for money and competition keeping that system alive and healthy as markets/products/technology/organizations naturally grow and die and economies fluctuate. Stasis and one-sided deals are unsustainable, which is what this type of arrangement buys you.
Corporations being allowed to use state power for their own benefit (at the expense of their customers and/or competition) has nothing to do with free markets. All you're left with then are companies who rake in money from customers without trading full value or excluding competition from existing. That's not a market or a useful system for any society.
Regulations to serve some higher public good that markets can't practically account for are very different from individual corporations writing laws to benefit only themselves in the marketplace. Boeing selling more dangerous airplanes (even if that happens through government coordinated processes) and losing Airline customer's trust would be terrible for any real business, assuming there is competition and customers who aren't forced to buy from them.
