I'm not sure that SWA will ever lead anything where technology is concerned, but, apparently we've hired some technical pilots from Alaska to implement the 'super' RNP that Alaska is doing up there down here in the lower 48. West Jet is also doing some of those approaches above the border, but so far, there are none in the lower 48.
I doubt we'll be 'leading' in that we can't even do gps overlays or gps T's or constant rate approaches yet. But supposedly we're going to get there with the whole fleet (even the 300's) sometime around 2013 (just far enough in the future to be plausible and for the guilty parties that started all of this to be safely retired before any 'issues' come up)
the name is stupid, RNP. most planes already have ANP and RNP and Rnav approaches. but apparently this is what Alaska calls it's super RNAV arrivals, the ones with curving final approach segments, rolling wings level at 300 feet, ILS mins, that kind of stuff. far beyond any current GPS approach in the lower 48.
So, in summary, I'm not sure I buy the fact that we'll be LEADING anything but supposedly we are going to get there. And since no one is doing this 'RNP' in the lower 48, I doubt CAL is either. I think the terminology confuses many, including me. But a regular RNAV approach (LNAV/VNAV) is NOT RNP as these Alaska technical pilot guys define it.