The U.S. cannot maintain air superiority in any kind of meaningful fight against first tier opponents. From William Schryver at metatronink.substack.com:

General Mark Milley — a man who knew but said nothing as his country slouched towards Armageddon.
I have long asserted, and I continue to be convinced, that the US could NOT establish air superiority against Russia, China, nor even Iran — not in a week; not in a year. Never. It simply could not be done. It would be a logistical power projection challenge well beyond the current capabilities of the United States military.
American air power would prove substantially inferior to the extremely potent and abundantly supplied air defenses arrayed against it in any of those three countries.
American suppression of enemy air defenses would prove woefully inadequate to the task.
And even if any of the US’s aerial wunderwaffen were to prove, in ideal circumstances, to be potent weapons, US air power as a theater-wide undertaking could not be sustained in the context of a non-permissive regional and global battlefield.
In a high-intensity combat scenario in either eastern Europe, the China seas, or the Persian Gulf, the maintenance requirements for US aircraft could not be met. Mission-capable rates would plummet even lower than their notoriously abysmal peacetime standards.
The US would, quite literally after only a few days, see sub-10% mission-capable rates for the F-22 and F-35, and sub-25% rates for almost every other platform in the inventory.