It really helps to understand the stock market price as expectation of future earnings. Everyone knew there was a very good chance of the strike happening, so it was already factored into the price of the stock. It actually happening was a non event for the stock market. No one thought UAL was declaring bankruptcy, so you see it becoming factored into the stock price in a matter of minutes.

Now, if the strike drags on longer than anyone expects, you'll see boeing stock slide. For the vast majority of shares, those expectations are set by people who do nothing but think about boeing and airbus all day and most of the night.