I asked a similar question last week: NWA.com was showing lowest fare class as "V", but Galileo was showing L&T. Flyertalkers told me that L&T were consoildator fares.

However, on nwa.com today, I was checking the price of the itin I booked, and it now shows "T" as the lowest fare. Which, btw, was about $20 more expensive than my "V" ticket.

Weird.