The E3 fleet is aging and difficult to keep airworthy. Of the 32 or so planes the US has, it sounds as though they struggle to keep the operational number above 16, and moving more to the gulf means they have to pull them from other theaters. In short, they simply don't have enough to provide coverage of all the areas they want them.

This was completely foreseeable and is a situation that appears to have arisen entirely due to vest interests stifling procurement of a suitable replacement in order to spruik up business for their own competing, but unfinished offering. Prior to the war in Iran, total cancellation of the procurement of E7's had been announced.

https://theaviationist.com/2026/04/01/e-3-awacs-loss-saudi-a...