Before he started in the airline industry, and long before he was the CEO of United Airlines, Scott Kirby was a serious gambler. He taught himself to count cards, raking in money on trips to Atlantic City and Las Vegas. To this day, he brags about getting kicked out of casinos all over the world. He’s still on the banned list in hotels up and down the Vegas Strip. A few years ago, he walked into the Bellagio during Super Bowl week and headed for the high-limit poker table. To set up a line of credit, Kirby handed over his…