 Out of the top stories we're working on here at WTOP. We're following major air travel disruptions today as several big airlines have grounded their flights. Also, metro riders are dealing with delays as part of this global tech outage. Former President Trump speaks at the RNC and describes the attempt on his life. A two-year-old is hit amid a shooting that left two adults dead in D.C. Keep it here. We'll have full details on these stories in the minutes ahead. 548.