The news is reporting that the FAA will require a second cockpit barrier on new aircraft by 2025. I'm presuming, though not stated, that would apply to new type designs, rather than present type certified models ( which would be retroactive to certification basis), but I will watch with interest to see which airliner models are captured by the new regulation:
https://www.cbc.ca/news/world/faa-co...iers-1.6876098
I'm imagining what that might entail, and thinking that the aisle to the cockpit is about to become very crowded....