There was close coordination between Trump and Israeli gov before the US strikes. At Trump’s request, IAF destroyed as many Iranian AD systems as possible in
southern Iran.
Important detail:
The fighters en route from the US to Europe heading to the ME were, according to Open Source, heading to Muwaffaq Salti Air Base in Jordan.
It seems that a major refueling operation took place on the route from Jordan > Iraq > Iran, at the same time that the B-2 Spirit was heading to Iran.
I emphasize this because the B-2 could only have followed the Syria-Iraq-Iran or Israel-Jordan-Iraq-Iran route, according to the positioning of the F-22s and other aircraft at Muwaffaq Salti Air Base.
The IAF had already attacked the reactor at Arak with what appears to be the 80 km Popeye missile:
Some local air superiority to Arak had been established for the IAF to have used the Popeye on the Arak reactor. Arak is 100 km from Fordow.
There was also an unprecedented buildup at Prince Sultan Air Base in Saudi Arabia.
This clearing of the southern air corridor seems like interesting news, because I don't see the B-2 taking the southern route unless Israel actually cleared the air corridor first, but the IAF had already established a viable air corridor to Arak, so I would have thought the most likely route would be the same one the IAF took to reach Arak, through western Iran, not south as the article mentions.