WORKING THIS STORY AGAIN TODAY FOR US. MARTHA, THANK YOU. >>> MEANTIME, HERE IN THE U.S., WE'RE LEARNING ABOUT YET ANOTHER CLOSE CALL AT A U.S. AIRPORT. AT LEAST SEVEN INCIDENTS SO FAR THIS YEAR, AND THIS TIME, A UNITED FLIGHT FORCED TO ABORT TAKEOFF FROM REAGAN NATIONAL AIRPORT. TONIGHT RIGHT HERE, YOU WILL HEAR AIR TRAFFIC CONTROLLERS URGING THAT COCKPIT TO HALT TAKEOFF. SO, WHAT HAPPENED ON THAT RUNWAY? AND IT ALL COMES JUST AS THE FAA HELD A SAFETY SUMMIT TODAY. HERE'S GIO BENITEZ AGAIN TONIGHT. >> Reporter: TONIGHT, AFTER A STRING OF RECENT NEAR-COLLISIONS INVOLVING COMMERCIAL JETS, ANOTHER CLOSE CALL REPORTED AT REAGAN NATIONAL AIRPORT. AN AIR TRAFFIC CONTROLLER WARNING A UNITED PILOT NOT TO TAKE OFF. >> UNITED 2003, CANCEL TAKEOFF CLEARANCE. >> ABORTING TAKEOFF. ABORTING TAKEOFF. >> Reporter: THE FAA SAYS ON MARCH 7th, A REPUBLIC AIRWAYS FLIGHT CROSSED A RUNWAY WITHOUT CLEARANCE AS THE UNITED AIRLINES FLIGHT WAS PREPARING TO TAKE OFF ON THE SAME ONE.██PTHAT MAKES A CALLS ALREADY THIS YEAR. SECRETARY OF TRANSPORTATION PETE BUTTIGIEG VOWING ALL HANDS ARE ON DECK TO INVESTIGATE THE ISSUE. HOW CONCERNED ARE YOU? >> I'M VERY CONCERNED. THIS YEAR, WE'RE ON TRACK TO HAVE MORE THAN 20. AND EVEN ONE IS ONE THAT I WOULD NOT LIKE TO SEE HAPPEN. >> Reporter: AT THE FAA SAFETY SUMMIT TODAY, LEADERS HOLDING A SWEEPING REVIEW OF WHAT'S GOING WRONG, AND HOW TO CALM THE PUBLIC'S CONCERNS. >> FLYING IS SAFE, BUT IN ORDER TO KEEP IT THAT WAY, WE HAVE TO BE RELENTLESSLY FOCUSED, AND FRANKLY, IT IS OUR DUTY TO BE CONCERNED. >> Reporter: THE UNION REPRESENTING AIR TRAFFIC CONTROLLERS SAYING THERE'S A "STAFFING ISSUE" CURRENTLY, WITH 1,200 FEWER ATC OPERATORS THAN TEN YEARS AGO, AND EMPHASIZED IT IS TRAINING ITS WORKFORCE TO FACE THE POST-PANDEMIC TRAVEL SURGE. AND DAVID, WHILE WE HAVEN'T SEEN A DEADLY COMMERCIAL CRASH IN AMERICA IN 14 YEARS, THE NTSB CHAIRWOMAN SAYS THAT THE ABSENCE OF A FATALITY DOES NOT MEAN THE PRESENCE OF SAFETY. DAVID?