Originally Posted by AutoSlash

There is no code that is more or less likely to get checked when you're using a corporate code you're not authorized for. If the agent is going to check they are going to check regardless if it says ABC Corp Employees or XYZ Corp Employees. Think about it logically.... It's not like they're going to say, "Hmm... This guys looks like he could work for Microsoft, but I just don't see him being a Bombardier guys, so I better make sure."

And no, at that point, the jig is up. You've lost. You can't just switch to the Costco code. Either pay the walk-up rate or literally walk with your tail between your legs. There are so many legitimate ways to get a great rate, why bother taking a chance using a discount you're not authorized for?