Congrats to F9 and ONT. Before the pandemic, ONT was on F9's radar with anticipated new routes of MIA, GUA, SAL, EWR, LAS, and SEA. I had thought that they were going to turn ONT into their primary SoCal operation since NK was starting to set up shop in BUR and G4 was already in LAX, and F9 hadn't had a key operation in SoCal at all. When F9 was responding to the pandemic and rethought the network to focus mainly on DEN, Florida, and LAS, I thought ONT's future as a key in F9's network was done at least short term.
It would appear though that F9 sees something they like in ONT and is ready to continue their experiment there, but changed to better meet the needs of a changed industry. GUA, and SAL were long shots but seemed to have the Latino traffic so not surprised to see them not back. F9s strategy in EWR seems to have changed, and SEA seems to have been curtailed by DL's recent addition of 2x E7Ws and then AS responding quickly to DL by adding a 4th mainline flight, and then skipping the planned down gauge to 2 QX E75s during the winter. Continuing LAS and adding PHX, SMF, and SFO show that they're focusing seriously on the ONT market specifically, being some of the biggest markets out of there. They aren't afraid to go head to head with WN. ORD has shown potential since AA did it seasonal recently, and MIA was going to be part of the bridge with SAL and GUA flights, so glad to see MIA at least stay.