The journey from Los Angeles to Mammoth Mountain is long and often riddled with traffic, speed traps, and bad roads. On a good day it takes about five hours.  So I'm sure Horizon's new service from LAX to Mammoth Yosemite Airport will be a welcome edition. That is if you have the money. A one way ticket costs between $79 and $99 and adult lift ticket costs $79. 

http://www.latimes.com/business/la-fi-mammoth14-2008jul14,0,2392579.story

Personally, I'm not sure when you add in check-in time at the airport and baggage and transfer costs that it's worth it. I'm sure the views will be great though!