Carl Quintanilla and Sara Eisen kicked off the hour with fresh news out of SpaceX before turning to a sell-off in Alphabet shares with veteran tech investor Dan Niles. Plus: energy prices also falling as the U.S.-Iran deal talks make progress... What could come next - with one former diplomat that played a key role in Obama's Iran nuclear deal. Elsewhere this hour: a read on airline stocks - and whether higher airfares are here to stay; plus: one former Fed member's remembrance of his time working alongside Alan Greenspan - and what he thinks Greenspan would have thought about current market exuberance. Squawk on the Street Disclaimer