A new US Government Accountability Office (GAO) report shed some light on the high-profile F-35 Lightning II Joint Strike Fighter program. The F-35 is now in full-rate production (since March 2024), but there are still plenty of delays and wrinkles in the production of the world’s most popular 5th-generation fighter jet. As the aircraft are procured and produced over time, they are modernized (the ones being built now are Block 4).