We've strayed pretty far from the original topic here, but the reality is that the US military is literally running out of working aircraft because they're so old. The average age of USAF aircraft is now about 28 years. The fleet was allowed to decay and not substantially recapitalized during the GWOT. Many of the fighters in the combat coded inventory aren't even allowed to hit their original 9G maneuvering limit any more due to accumulated airframe fatigue. Now we're paying an overdue bill.

And let's please not have any uninformed claims that somehow cheap "drones" will magically make large, expensive manned aircraft obsolete. Small, cheap drones are effective in a trench warfare environment like the current conflict in Ukraine but they lack the range, speed, and payload necessary to be useful in a potential major regional conflict with China. And the notion of relying on AI for any sort of complex mission in a dynamic environment remains firmly in the realm of science fiction: maybe that will be feasible in a few decades but for now any really complex missions still rely on humans in the loop to execute effectively.

The problem is that fighter aircraft have gotten too expensive to afford to build, even for a nation.