 Also, this outage is grounding flights around the world, impacting financial institutions, including the London Stock Exchange. Here in the U.S., several major airlines, including Delta, American, and United, have issued ground stops, and the FAA is telling air traffic controllers the airlines are experiencing communication issues. WTOP's Dan Ronan is a commercial pilot. He joins us live now. Dan, what do we know so far this morning about this grounding and why it is happening?