First Class less than Biz and Economy Saver

Here's an odd little something we just discovered this afternoon while looking for flights. First Class from Los Angeles to Miami for $388 each way. You'll see from the screen grab below that's much cheaper than what's being offered in Business Class ($1,748 each way) and even Economy Saver ($664 each way).

*Update: Apparently, this is due to a difference in aircraft - 757s vs. 777s. Thanks to everyone who clued us in via Twitter!