in. the faa investigating a near-collision at chicago's midway airport. two jets were taking off at the same time on intersecting runways when an air traffic controller yelled for one of the planes to stop. here now, abc's david kerley. >> reporter: at chicago's midway airport, two jets on a collision course with similar flight numbers, trouble on the radio. >> runway 3-1 center clear for takeoff. the wind 0-6-0 center. >> reporter: that's a southwest jet, flight 3828, getting cleared. but a delta flight, 1328, is lined up on an intersecting runway and it starts rolling for takeoff, too. the two jets, gaining speed, heading towards each other. the controller sees it. >> 1328 stop! stop! >> i am holding. >> he's stopping. >> both jets slam on the brakes, stopping short of each other. >> for southwest on 3-1 center. were we the ones cleared for takeoff? >> yes. you were doing what you were supposed to be doing. >> the delta was rolling also?