America Remembers 9/11: 20 Years Later. Plus, The Market's 4-Day Losing Streak, Pres. Biden's Sweeping Vaccination Push, The Biden-Xi Phone Call, Beijing's Crackdown on Tech, and Affirm Soars - "Buy Now?"

Squawk on the Street

Carl Quintanilla, Jim Cramer and David Faber led off the show with reflections on 9/11 twenty years later, including a look back at what David and the late Mark Haines said on CNBC after the World Trade Center's twin towers were struck. The NYSE and Nasdaq each observed a moment of silence prior to the opening bell. Don Carty was the CEO of American Airlines parent AMR on 9/11 twenty years ago. He appeared on the program and shared his recollections of that day -- as well as his thoughts on how the airline industry has rebounded. Bob Pisani looked back at how 9/11 forever changed New York's financial district. As for the markets, Carl, Jim and David took a closer look at stocks with the Dow and S&P 500 in the midst of a four-day losing streak. They discussed President Biden's Thursday phone call with China's President Xi. Cramer offered his take on how investors should assess this development. The anchors also looked at where China's crackdown on tech companies fits into the picture. Speaking of tech, shares of "buy now, pay later" company Affirm soared on upbeat revenue and guidance. The anchors reacted to what Affirm Co-Founder & CEO Max Levchin told CNBC about his company benefiting from customer satisfaction. Also in focus: Pres. Biden's new COVID-19 mandates and the reopening trade, Take-Two Interactive delaying new versions of "Grand Theft Auto" by four months, plus the latest on Coinbase vs. the SEC.