Is there a way to know the exact fare class prior to booking? I went through and just did a dummy booking for SJC-YVR-YKA that will be Tango. I see that S T A L K earns reduced miles. But my worry is that it also lists F as a Tango fare which is 0 crediting to MP. I don't care about PQS but for a $600 coach ticket I better get some miles.