Because of the "New WN", I signed up for it (and there's a promo that ends today, 19th!) that gives you their discount fare club for free for a year if you book a flight today: https://flights.flyfrontier.com/en/flight-deals). I figure if I fly even 2 segments in the next ~17 mos it'll have paid for itself.

But for an airline named "Frontier" they have woefully few flights from the West Coast; their schedule (and I'm looking at both SAN and SNA) is even more sparse than NK's. And like @nsx found out, it was hard to schedule even a segment run as the ONE N/S to LAS/DEN/SFO leaves before the last NS going even arrives; I found a Friday SAN/PHX/SAN and that took ~30 mins to find. At least it was ~$65 all-in.