Officials told the GAO the decision to exclude the F-22 stems from the fighter's "reduced role in the future force structure," among other factors.
Pratt & Whitney's deliveries of F135 engines are on hold while the U.S. military and contractors try to find the root cause of a Dec. 15 F-35 mishap.
The F-35 Joint Program Office told services a fuel tube failure may have caused an F-35B's crash, which has now led to some fighters being grounded.
The Pentagon plans to spend about $100 billion in the next five years to modernize its tactical aviation fleets.
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