close in the skies and this morning we know the faa is now investigating. >> 601, a right turn. two more passenger planes get too close in the skies. on may 9th, united flight 601 and united 437 took off from bush intercontinental airport in houston at roughly the same time. shortly after takeoff, flight 601 is told to turn right putting it in the path of the other plane. moments later, the controller seems to realize the mistake. >> 601, stop the turn right there, sir. stop your turn. stop your climb. stop your turn 601. >> reporter: the two planes came within nearly a mile of each other. 300 passengers on both flights may not have been aware of the close call but the pilots were left with questions as to what went wrong. >> 601, you know what happened there? >> basically crossed directly