Originally Posted by
tjisnumbaone
"B, M are considered "Select Fares"
This is not accurate. Select fares are not a category to be compared to full fare or discount fares. B and M are also discounted. Selct fares can include H/Q/K, depending upon the market.
To the OP. only Y is full fare, and even then I'm not 100% sure all Y fares are considered full fare. What
Mersk862 said is accurate as it pertains to the upgrade chart.