Congress has docked the F-35 program for delays in the Block 4 upgrades for the fighter, but it well may be that some of the envisioned Block 4 features will move to the U.S. Air Force's future Collaborative Combat Aircraft. "Block 4 will ensure F-35 relevance in a high-end fight against our peer competitors," the Air Force wrote in an Aug. 29 email in response to questions on Block 4. "The Air Force expects Full Block 4 capability in Lot…
