A Delta Air Lines flight experienced a near-miss with a U.S. Air Force T-38 jet shortly after departing from Ronald Reagan Washington National Airport, prompting the Airbus A319's Traffic Collision Avoidance System to alert the crew. Delta Air Lines confirmed that the crew responded appropriately, ensuring the safety of all 131 passengers and crew members on board, and the flight proceeded to its destination without further issues. The Federal Aviation Administration is investigating the incident to determine the factors that led to the close encounter and to prevent similar occurrences in the future, with Delta Air Lines fully cooperating in the investigation.