On Apollo, actually. Oddly enough, the fare structure IAD-SAN is completely different, with the GOV Y at $638 right now and several lesser classes down to Q at $260 (by the way, all fares I've quoted are one-way). The best auto-upgrade fare (for 1K, at least) is M at $527, which doesn't seem so bad since it's only about 20% cheaper than the regular M, although the latter requires a roundtrip.