<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by FWAAA:
Yes. The first letter is what matters. They are M and V (both of which earn miles). 
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Usually, but not always. Look up booking code in the fare rules. Most of the exceptions are the "Y-UP" fares that book in A rather than Y.
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"It's as easy as 1, 2, C" -- Kelly,
Married With Children