Originally Posted by travelinfoo

I've also seen some mention of pro/amateur sports club affiliation. I've never been asked but carry my club membership w/me just in case

Agree w/Flying Lawyer. The MVP is a code open to the public. The corporate code that RingoNBoo is recommending you try to sniff out is NOT a public code. It is supposed to be for use of that company. ALso be aware that if you use a code you are not entitled to and CANNOT produce ID as proof, you will be charged rack rate. You won't have an argument against it.

I've traveled on gov codes and almost always got asked about my ID.