GettyThis post originally appeared in the Insider Today newsletter.You can sign up for Business Insider's daily newsletter here.Almost Friday! Flight delays and cancellations stink, but here's some good news: A new regulation requires airlines to process automatic refunds.In today's big story, we're looking at how millennials have seen their wealth explode over the past few years.What's on deck:Markets: Meet the mom-and-pop investors who got in on Nvidia before the hype.Tech: Meta shares tumble despite Mark Zuckerberg laying out plans for AI investments.Business: These 20 private-equity firms are making big moves in sports.But first, we're back!If this was forwarded to you, sign up here.The big storyMillennial money makersIurii Garmash/Getty, Pineapple Studio/Getty, Arx0nt/Getty, Tyler Le/BIThey laughed at our avocado toast.