[4/26 15:00] Nebius Meta AI infrastructure deal expansion / Wall Street optimism returns to AI trade

AI News Flash for April 26, 2026 at 15:00 UTC. Topics: 1. Nebius Meta AI infrastructure deal expansion https://www.quiverquant.com/news/Nebius+Stock+%28NBIS%29+Opinions+on+Expanded+Meta+AI+Deal 2. Wall Street optimism returns to AI trade https://finance.yahoo.com/markets/article/a-return-to-optimism-wall-street-strategists-are-bullish-on-the-ai-trade-143000172.html 3. Middle East helium shortage hits NVIDIA supply chain https://simplywall.st/stocks/us/semiconductors/nasdaq-nvda/nvidia/news/helium-shock-tests-nvidia-ai-supply-chain-and-investor-expec 4. US Air Force AFTA flight test AI tool https://aerospaceglobalnews.com/news/us-air-force-ai-afta-flight-test-planning/ 5. AMA urges Congress on mental health chatbot regulations https://medcitynews.com/2026/04/ama-ai-mental-health-chatbot/