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Other things. so it is very concerning. >> a lot of travellers this weekend. for the memorial day holiday. bottom line how worried should they be? >> well, at this point you know it is no more worrisome than it ever was. and that is probably not very comforting for people to hear. but nonetheless it is important to remember that on board each aircraft they have collision-prevention systems. what it tells the pilot if he is in danger and they will take care of it. and make the corrective action. >> well, let's hope nothing untoward happens. >> up next, the couple who escaped the costa concordia...

Assigned them, they had to plunge fast. >> this would be the same as a pilot making a mistake. but remember, there is avionics on board, one is collision assistance. >> the nation's skies are under stress with increasing air traffic and a potential shortage of controllers. the faa says it has taken steps to prevent any similar occurrences in the future but would not elaborate. renee marsh, cnn, washington. joining us now, cnn safety analyst david souci, the author of "why planes crash" and investigator for safe skies. david, this near miss in houston, the planes came within nearly a mile of ...

Error, through a pilot making a mistake, but remember, there's avionics on board, particularly one called tcas, collision avoidance assistance. >> reporter: the faa has taken steps to prevent occurrences in the future but didn't say what the steps are. the faa also telling us an instructor was there at the moment of this incident ready to step in if necessary. however, the faa saying that this trainee was able to correct the problem immediately. we want to point out one other thing, wolf. ever since that technology, the collision avoidance technology has been placed in cockpits we haven't seen...

Through a pilot making a mistake. but remember, there is avionics on board, particularly one called collision avoidance assistance. >> reporter: the faa says it has taken steps to prevent any similar occurrences in the future but they didn't say what those steps were. these air traffic controllers are trained in real-time. we do know an instructor was there at the moment this incident happened ready to step in, if needed. but the trainee realized the mistake immediately and corrected the problem immediately. we do know that the flights continued safely to their destinations. still, when you he...

Yet, but that's the warning sign that one could happen, brianna. and that's how they analyze these circumstances where it's all happening very, very quickly. >> certainly too close. you can see it when you put it that way, tom. what happens if two planes get inteach other's space and the tower just for some reason doesn't notice, doesn't warn them? then what? >> well, interestingly enough, there is a system for that. let's say this happens. they're getting into each other's space and they're getting deeper into each other's space, that's when this kicks in. for some years now, congress has man...