to the other tcas computer in the other plane, and those computers will tell each other look, we re getting too close. you go high and i ll go low. and we will not run into each other. and in fact, since this has started, there has not been a single mid-air collision between two jets that are outfitted with the a tcas system. that s pretty important, as we all keep flying in greater and greater numbers, breene. that that. is an impressive last line of defense. thanks for explaining, tom foreman. you re welcome, brianna. and outfront tonight, richard quest and cnn aviation analyst mary schiavo. so mary, you have heard this. the fourth near collision in the past month. is this happening more, or it is just being reported more? well, it s both. back in 2010, 2009-2010, there was a 50% increase in the office of inspector general, my old office did a study. and they found both. they found that they were reporting more because the faa put in an amnesty program. if you turn yourself