Hmmm... they just pushed through another set of changes.... back to a 777 now as flight 274. While I never have done it myself, I have witnessed what a major pain in the rear scheduling aircraft can be. I imagine there aren't enough planes to cover the schedule...

You can see other flights like 274 right now taken out of .bomb.... just look at LAX-SFO LAX-DEN ORD-DEN, etc. on the 28th...