They've already produced over 1000 of the ~ 2400 they are expected to produce. As for upgrades.. they're behind schedule.[0] There's Tech Refresh 3, which look

They've already produced over 1000 of the ~ 2400 they are expected to produce. As for upgrades.. they're behind schedule.[0] There's Tech Refresh 3, which looks to be improved computers/displays/software, which is needed for Block 4, "which will include new sensors, the ability to carry more long-range precision weapons, more powerful data fusion, increased interoperability with other platforms and advanced electronic warfare capabilities."[1] [0] https://www.defensenews.com/air/2023/03/30/f-35-upgrades-slip-to-2024-drawing-lawmakers-ire/ https://www.defensenews.com/air/2023/03/30/f-35-upgrades-sli... [1] https://www.defensenews.com/air/2023/12/15/f-35-head-warns-future-upgrades-at-risk-production-shutdown-possible/ https://www.defensenews.com/air/2023/12/15/f-35-head-warns-f...